Killing of Brian Thompson#Suspect

File:Brian Thompson.webp

Brian Thompson was the chief executive officer (CEO) of UnitedHealthcare, the insurance arm of UnitedHealth Group, from April 2021 until his death. He had worked for UnitedHealthcare since 2004.{{cite news |date=July 17, 2024 |title=Q2 2024 Unitedhealth Group Inc Earnings Call |url=https://finance.yahoo.com/news/q2-2024-unitedhealth-group-inc-062105818.html |access-date=December 5, 2024 |work=Yahoo Finance |agency=Thomson Reuters StreetEvents |archive-date=December 5, 2024 |archive-url=https://web.archive.org/web/20241205013014if_/https://finance.yahoo.com/news/q2-2024-unitedhealth-group-inc-062105818.html |url-status=live}}UnitedHealthcare insures 49 million Americans and generated $281 billion in revenue for the 2023 fiscal year.{{Cite news |last=Murphy |first=Tom |date=December 5, 2024 |title=Words on ammo in CEO shooting echo common phrase on insurer tactics: Delay, deny, defend |url=https://apnews.com/article/unitedhealthcare-ceo-shooting-delay-deny-defend-depose-ee73ceb19f361835c654f04a3b88c50c |url-status=live |archive-url=https://web.archive.org/web/20241205201043/https://apnews.com/article/unitedhealthcare-ceo-shooting-delay-deny-defend-depose-ee73ceb19f361835c654f04a3b88c50c |archive-date=December 5, 2024 |access-date=December 5, 2024 |work=Associated Press}} Under his leadership, UHC's profits increased from $12 billion in 2021 to $16 billion in 2023, and his total annual compensation was $10.2 million.{{Cite web |last=Rogelberg |first=Sasha |date=December 5, 2024 |title=Slain UnitedHealthcare CEO Brian Thompson's tenure was marked by rocketing profits—and myriad accusations of insider trading and coverage denial |url=https://fortune.com/2024/12/05/unitedhealthcare-ceo-brian-thompson-lawsuits-social-media-reaction-motive/ |access-date=December 5, 2024 |website=Fortune |archive-date=December 5, 2024 |archive-url=https://web.archive.org/web/20241205215346/https://fortune.com/2024/12/05/unitedhealthcare-ceo-brian-thompson-lawsuits-social-media-reaction-motive/ |url-status=live }}{{Cite news |last=Abelson |first=Reed |date=2024-12-04 |title=Brian Thompson Was a Veteran Executive at UnitedHealthcare |url=https://www.nytimes.com/2024/12/04/health/brian-thompson-unitedhealthcare.html |access-date=2025-04-24 |work=The New York Times |language=en-US |issn=0362-4331}} At the time of Thompson's death, the company was the largest health insurer in the United States.{{Cite web |last=Florko |first=Nicholas |date=December 5, 2024 |title=Murder Is an Awful Answer for Health-Care Anger |url=https://www.theatlantic.com/health/archive/2024/12/thompson-murder-unitedhealthcare-fury/680897/ |access-date=December 7, 2024 |website=The Atlantic}}

UnitedHealthcare has repeatedly faced criticism for its approach to handling claims.{{cite web |first1=Sarah |last1=Kliff |first2=Reed |last2=Abelson |title=UnitedHealthcare has faced scrutiny, criticism and lawsuits over its denial of medical claims. |website=The New York Times |url=https://www.nytimes.com/live/2024/12/05/nyregion/brian-thompson-unitedhealthcare-news#delay-deny-defend-united-health-care-insurance-claims |access-date=31 December 2024 |date=5 December 2024}} It and other insurers were named in an October 2024 report from the United States Senate Homeland Security Permanent Subcommittee on Investigations showing a surge in prior authorization denials for Medicare Advantage patients. Reports of increasing rates of prior authorization denials prompted investigations by ProPublica and the United States Senate, investigations which were described as a "stain" on Thompson's time of leadership by Fortune. According to Thompson's widow, he had been receiving threats related to a "lack of [insurance] coverage".{{Cite news |last1=Burke |first1=Minyvonne |last2=Li |first2=David K. |last3=Fonrouge |first3=Gabrielle |date=December 4, 2024 |title=UnitedHealthcare CEO fatally shot outside NYC hotel in 'premeditated, preplanned targeted attack' |url=https://www.nbcnews.com/news/us-news/man-fatally-shot-nyc-hotel-police-say-rcna182789 |access-date=December 4, 2024 |work=NBC News |quote=Basically, I don't know, a lack of coverage? I don't know details. I just know that he said there were some people that had been threatening him. |archive-date=December 4, 2024 |archive-url=https://web.archive.org/web/20241204144142if_/https://www.nbcnews.com/news/us-news/man-fatally-shot-nyc-hotel-police-say-rcna182789 |url-status=live}} In May 2024, a lawsuit was filed against Thompson along with Stephen Hemsley and two other senior executives for alleged fraud and insider trading due to failing to disclose an antitrust investigation into the company by the United States Department of Justice and by selling stock options before the probe was made public.{{Cite web |last=Goldman |first=John Towfighi, David |date=2024-12-04 |title=Who was Brian Thompson, the CEO of UnitedHealthcare fatally shot in Manhattan? {{!}} CNN Business |url=https://www.cnn.com/2024/12/04/business/who-was-brian-thompson |access-date=2025-06-02 |website=CNN |language=en}}

The suspect arrived in New York City on November{{nbsp}}24, 2024, on a Greyhound bus. The bus route began in Atlanta, Georgia, but authorities do not know from which city or town he boarded.{{Cite news |last1=Radford |first1=Antoinette |last2=Hammond |first2=Elise |last3=Sangal |first3=Aditi |last4=Powell |first4=Tori B. |last5=Faheid |first5=Dalia |date=December 5, 2024 |title=Live updates: Police search for gunman after UnitedHealthcare CEO killed in New York City |url=https://www.cnn.com/us/live-news/unitedhealthcare-brian-thompson-death-12-5-24#cm4bztz4700003b6rqpy8694l |access-date=December 6, 2024 |work=CNN |archive-date=December 6, 2024 |archive-url=https://web.archive.org/web/20241206050647/https://www.cnn.com/us/live-news/unitedhealthcare-brian-thompson-death-12-5-24#cm4bztz4700003b6rqpy8694l |url-status=live}}{{Cite news |date=December 5, 2024 |title=Live Updates: Police Release Photos Showing Face of Man Sought in Killing of Insurance C.E.O. |url=https://www.nytimes.com/live/2024/12/05/nyregion/brian-thompson-unitedhealthcare-news |url-access=limited |url-status=live |archive-url=https://web.archive.org/web/20241205133432if_/https://www.nytimes.com/live/2024/12/05/nyregion/brian-thompson-unitedhealthcare-news |archive-date=December 5, 2024 |access-date=December 5, 2024 |work=The New York Times}} He checked into the HI New York City Hostel on the Upper West Side of Manhattan on November{{nbsp}}24, 2024 with a falsified New Jersey identification card; he paid for his stay in cash.{{Cite web |last1=Taylor |first1=Lorraine |last2=McAdams |first2=Alexis |date=December 5, 2024 |title=UnitedHealthcare CEO Brian Thompson's killer used fake ID to check into NYC hostel before slaying: sources |url=https://www.foxnews.com/us/unitedhealthcare-ceo-brian-thompsons-killer-used-fake-id-check-nyc-hostel-before-slaying-sources |access-date=December 5, 2024 |work=Fox News |archive-date=December 6, 2024 |archive-url=https://web.archive.org/web/20241206002647if_/https://www.foxnews.com/us/unitedhealthcare-ceo-brian-thompsons-killer-used-fake-id-check-nyc-hostel-before-slaying-sources |url-status=live}} He stayed at the hostel for all but one night of the 10 days he was in New York City at the hostel, checking out on December{{nbsp}}3, 2024.

File:CCTV video of Brian Thompson being killed.webm video of Thompson's killing]]

Thompson was in New York City for an annual UnitedHealth Group investors' meeting, having arrived from Minneapolis on December 2, 2024.{{Cite news |last1=Katersky |first1=Aaron |last2=Shapiro |first2=Emily |last3=Cohen |first3=Miles |date=December 4, 2024 |title=UnitedHealthcare CEO Brian Thompson shot dead in Midtown Manhattan, masked gunman at large |url=https://abcnews.go.com/US/man-shot-chest-midtown-manhattan-masked-gunman-large/story?id=116446382 |access-date=December 5, 2024 |work=ABC News |archive-date=December 4, 2024 |archive-url=https://web.archive.org/web/20241204223549if_/https://abcnews.go.com/US/man-shot-chest-midtown-manhattan-masked-gunman-large/story?id=116446382 |url-status=live}} On December 4, at around 6:45 a.m. EST (UTC−5), Thompson was walking along West 54th Street toward the New York Hilton Midtown hotel that was hosting the meeting.{{Cite news |last=Breen |first=Kerry |date=December 7, 2024 |title=Gunman who killed Brian Thompson, UnitedHealthcare CEO, is on the loose. What we know about the suspect. |url=https://www.cbsnews.com/news/brian-thompson-united-healthcare-ceo-shooting-suspect-gunman-new-york/ |access-date=December 8, 2024 |work=CBS News |archive-date=December 7, 2024 |archive-url=https://web.archive.org/web/20241207023421/https://www.cbsnews.com/news/brian-thompson-united-healthcare-ceo-shooting-suspect-gunman-new-york/ |url-status=live}} The assailant waited across the street from the hotel for several minutes, then crossed over when he saw Thompson.{{Cite news|url=https://www.bbc.co.uk/news/articles/c7ve36zg0e5o|title=What we know about fatal shooting of health executive Brian Thompson |date=December 5, 2024 |work=BBC News |first1=Bernd Jr.|last1=Debusmann|first2=Christal|last2=Hayes|access-date=December 7, 2024|archive-date=December 7, 2024|archive-url=https://web.archive.org/web/20241207023419/https://www.bbc.co.uk/news/articles/c7ve36zg0e5o|url-status=live}}{{Cite news |last1=Mascarenhas |first1=Lauren |last2=Chowdhury |first2=Maureen |last3=Yan |first3=Holly |date=December 4, 2024 |title=UnitedHealthcare CEO fatally shot in New York City |url=https://edition.cnn.com/us/live-news/unitedhealthcare-brian-thompson-death-12-04-24#cm4a356lf00003b6m6nr979mg |access-date=December 4, 2024 |work=CNN |archive-date=December 4, 2024 |archive-url=https://web.archive.org/web/20241204172433if_/https://edition.cnn.com/us/live-news/unitedhealthcare-brian-thompson-death-12-04-24/#cm4a356lf00003b6m6nr979mg |url-status=live}} Standing approximately {{convert|20|ft|m|0}} away from Thompson when he arrived at the entrance, the assailant fired three times at him from a suppressed 9 mm pistol,{{cite web |last1=Barnes |first1=Oliver |title=Luigi Mangione charged with murder of US health insurance executive |url=https://www.ft.com/content/4682c65f-fbf9-4be4-817d-3c01d4e524a7 |website=Financial Times |access-date=December 11, 2024 |date=December 10, 2024 |archive-date=December 11, 2024 |archive-url=https://web.archive.org/web/20241211013146/https://www.ft.com/content/4682c65f-fbf9-4be4-817d-3c01d4e524a7 |url-status=live}} striking him in the back and right calf. Three spent bullet casings were found at the scene, along with three ejected live rounds.

In the closed-circuit television camera (CCTV) recording of the killing, the shooter manually cycles the gun action after each shot, leading observers to believe that his weapon was a malfunctioning semi-automatic pistol.{{cite web |last1=Yankowski |first1=Peter |last2=Backus |first2=Lisa |last3=Leavenworth |first3=Jesse |title=Gun sold in Connecticut not linked to killing of UnitedHealthcare CEO, report says |url=https://www.registercitizen.com/news/article/uhc-ceo-shooter-brian-thompson-gun-sold-ct-19963567.php |website=The Register Citizen |access-date=December 13, 2024 |date=December 6, 2024}} The authorities believe it to be the weapon they found in the suspect's bag after his arrest{{Em dash}}a partially 3D-printed Glock 19 and 3D-printed suppressor.{{cite news |last1=Gibbons-Neff |first1=Thomas |last2=Toler |first2=Aric |title=When a Glock Isn't a Glock: The History of the Pistol Found With Luigi Mangione|date=December 12, 2024 |url=https://www.nytimes.com/2024/12/12/us/unitedhealthcare-luigi-mangione-gun.html |access-date=December 12, 2024 |work=The New York Times |quote=At first glance, the gun in the police photographs — the one the authorities believe Luigi Mangione used to kill the chief executive of UnitedHealthcare — appears to be a Glock-19, a 9-millimeter semiautomatic pistol ...{{pb}}But upon closer inspection, it is clear that the weapon was not factory-made, but was at least partially produced by a 3D printer. ...}}{{Cite web|date=December 9, 2024|title=Luigi Mangione's bag contained 3D printed pistol and silencer, criminal complaint says|first=Taylor|last=Romine|url=https://www.cnn.com/us/live-news/brian-thompson-unitedhealthcare-death-investigation-12-9-24#cm4hot8qo000c3b6njmzpnboz|access-date=December 9, 2024|website=CNN|archive-date=December 9, 2024|archive-url=https://web.archive.org/web/20241209191538if_/https://www.cnn.com/us/live-news/brian-thompson-unitedhealthcare-death-investigation-12-9-24#cm4hot8qo000c3b6njmzpnboz|url-status=live}}{{cite news |last1=McWhirter |first1=Cameron |title=UnitedHealth Exec Shooting Heightens Debate Over Ghost Guns |date=December 10, 2024 |url=https://www.wsj.com/us-news/ghost-gun-uhc-ceo-shooting-efb9819c |access-date=December 12, 2024 |work=The Wall Street Journal |archive-date=December 13, 2024 |archive-url=https://web.archive.org/web/20241213121932/https://www.wsj.com/us-news/ghost-gun-uhc-ceo-shooting-efb9819c |url-status=live}} The ghost gun consists of a 3D-printed lower receiver, metal slide, unserialized Glock 19 internals from a parts kit, including a threaded barrel, and uses a standard Glock magazine.{{cite web |last1=Penzenstadler |first1=Nick |title=Ghost gun tied to NYC murder of health care CEO adds fuel to debate on homemade guns |url=https://www.usatoday.com/story/news/nation/2024/12/09/ghost-gun-ceo-murder-arrest/76867066007/ |website=USA Today |access-date=December 12, 2024 |date=December 9, 2024 |archive-date=December 12, 2024 |archive-url=https://web.archive.org/web/20241212120856/https://www.usatoday.com/story/news/nation/2024/12/09/ghost-gun-ceo-murder-arrest/76867066007/ |url-status=live}}{{cite web |last1=Guarino |first1=Ben |title=Luigi Mangione's Alleged Ghost Gun and Other Antisurveillance Tech, Explained |url=https://www.scientificamerican.com/article/luigi-mangiones-alleged-ghost-gun-and-other-antisurveillance-tech-explained/ |website=Scientific American |access-date=December 19, 2024 |date=December 13, 2024}} The 3D-printed part's design was an iteration of "FMDA 19.2", a design released in 2021 by the libertarian group Deterrence Dispensed.{{cite magazine |last1=Greenberg |first1=Andy |title=The 'Ghost Gun' Linked to Luigi Mangione Shows Just How Far 3D-Printed Weapons Have Come |date=December 10, 2024 |url=https://www.wired.com/story/luigi-mangione-united-healthcare-3d-printed-gun-fmda-chairmanwon-v1/ |access-date=December 11, 2024 |magazine=Wired}}

The killer fled the scene on an e-bike to Central Park; there, near the Carousel,{{cite web |last1=Tsui |first1=Karina |last2=Morales |first2=Mark |last3=Gingras |first3=Brynn |last4=Miller |first4=John |last5=Prokupecz |first5=Shimon |last6=Hammond |first6=Elise |last7=Powell |first7=Tori B. |last8=Williams |first8=Ashley R. |title=Backpack found in Central Park believed to belong to suspect in killing of UnitedHealthcare CEO, source says |url=https://edition.cnn.com/2024/12/06/us/brian-thompson-unitedhealthcare-gunman-search-hnk/index.html |website=CNN |access-date=18 December 2024 |date=6 December 2024 |archive-date=December 17, 2024 |archive-url=https://web.archive.org/web/20241217150618/https://edition.cnn.com/2024/12/06/us/brian-thompson-unitedhealthcare-gunman-search-hnk/index.html |url-status=live }} he shed a backpack containing Monopoly money and a jacket before exiting the west end of the park at 77th Street.{{Cite news |last1=Offenhartz |first1=Jake |last2=Matthews |first2=Karen |last3=Sisak |first3=Michael |date=December 4, 2024 |title=Police hunt for UnitedHealthcare CEO's masked killer after 'brazen, targeted' attack on NYC street |url=https://apnews.com/article/manhattan-shooting-death-daa1e8c8c05606197a5bd2e0242f1683 |access-date=December 5, 2024 |work=Associated Press|archive-date=December 4, 2024 |archive-url=https://web.archive.org/web/20241204235553/https://apnews.com/article/manhattan-shooting-death-daa1e8c8c05606197a5bd2e0242f1683 |url-status=live}} According to the police, he then left the city from the George Washington Bridge Bus Station farther uptown in Upper Manhattan.{{Cite news |last=Cramer |first=Maria |date=December 6, 2024 |title=Live Updates: Investigators Sift Through Growing List of Tips and Details in Slaying of Insurance C.E.O. |url=https://www.nytimes.com/live/2024/12/06/nyregion/unitedhealthcare-ceo-brian-thompson/abb6ad03-20cb-57a6-a0ca-d4cca7e858c2 |access-date=December 6, 2024 |work=The New York Times}}{{Cite news |last=Kilgannon |first=Corey |date=December 6, 2024 |title=Here's the latest on the investigation. |url=https://www.nytimes.com/live/2024/12/06/nyregion/unitedhealthcare-ceo-brian-thompson/heres-the-latest-on-the-investigation |access-date=December 6, 2024 |work=The New York Times}} Thompson was taken to Mount Sinai West hospital, where he was pronounced dead at 7:12 a.m.{{Cite news |last1=Duddridge |first1=Natalie |last2=Brennan |first2=Dick |last3=Kramer |first3=Marcia |last4=Bauman |first4=Ali |last5=Moore |first5=Jessica |date=December 5, 2024 |title=UnitedHealthcare CEO Brian Thompson shot and killed in NYC. Police say it was a targeted attack. |url=https://www.cbsnews.com/newyork/news/midtown-manhattan-shooting-hilton-hotel/ |access-date=December 5, 2024 |work=WCBS-TV |archive-date=December 4, 2024 |archive-url=https://web.archive.org/web/20241204231718/https://www.cbsnews.com/newyork/news/midtown-manhattan-shooting-hilton-hotel/ |url-status=live}} According to a later autopsy report, Thompson died from a gunshot wound to the back of the torso.{{Cite web |last=Lee |first=Ella |date=2024-12-10 |title=UnitedHealthcare CEO shooting suspect charged with murder |url=https://thehill.com/regulation/court-battles/5032261-unitedhealthcare-ceo-shooting-suspect-charged-murder/ |access-date=2024-12-31 |website=The Hill}}{{Cite web |last=Harlow |first=Tim |date=2024-12-11 |title=Suspect in UnitedHealthcare CEO killing tussles with police outside Pennsylvania extradition hearing |url=https://www.startribune.com/luigi-mangione-charged-uhc-ceo-shot/601193083 |access-date=2024-12-31 |website=Startribune}}

{{clear}}

{{OSM Location map

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| mark-title6 = Central Park Carousel (abandoned backpack)

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• November 24, 10:11 p.m. – An unknown suspect arrives at the Port Authority Bus Terminal in Midtown Manhattan on a Greyhound bus which originated in Atlanta, Georgia, and makes up to seven stops en route.
• November 24 – Suspect checks into the HI New York City Hostel on the Upper West Side of Manhattan. His unmasked face was caught on CCTV during the check-in process. The suspect had two hostel roommates who said he would slip down his mask only when eating.{{Cite news |last=Cramer |first=Maria |date=December 6, 2024 |title=Live Updates: Police Have 'Reason to Believe' Gunman Who Killed C.E.O. Has Left New York City |url=https://www.nytimes.com/live/2024/12/06/nyregion/unitedhealthcare-ceo-brian-thompson/974d99ca-43bf-5230-bf1c-69a34c8d5328|access-date=December 6, 2024 |work=The New York Times}}
• November 24 – Suspect cases the New York Hilton Midtown hotel.
• November 29 – Suspect checks out of the HI New York City Hostel.
• November 30 – Suspect checks back into the HI New York City Hostel.
• December 4:
• 5:34 a.m. – Suspect leaves the hostel, and rides an e-bike to Midtown.{{cite web |last1=Loria |first1=Michael |title=New details emerge about Luigi Mangione, the man accused of killing health insurance CEO |url=https://www.usatoday.com/story/news/nation/2024/12/17/luigi-mangione-unitedhealthcare-ceo-brian-thompson-murder-timeline/77055135007/ |website=USA Today |access-date=December 18, 2024 |date=December 17, 2024}}
• 6:15 a.m. – Suspect is seen leaving the 57th Street F Train subway stop.{{Cite news |last1=Ley |first1=Jarrett |last2=Oakford |first2=Samuel |date=December 5, 2024 |title=A timeline of UnitedHealthcare CEO's shooting, tracking the suspect's movements |url=https://www.washingtonpost.com/investigations/2024/12/05/unitedhealthcare-ceo-shooting-timeline/ |newspaper=The Washington Post |access-date=December 8, 2024 |archive-date=December 5, 2024 |archive-url=https://web.archive.org/web/20241205211959if_/https://www.washingtonpost.com/investigations/2024/12/05/unitedhealthcare-ceo-shooting-timeline/ |url-status=live}}
• 6:17 a.m. – Suspect buys coffee, water, and granola bars at a Starbucks café (at 1380 6th Ave) two blocks away from the New York Hilton Midtown hotel, discarding the coffee cup and water bottle.
• 6:30 a.m. – Surveillance footage captures the suspect walking while talking on the phone.
• 6:39 a.m. – Suspect arrives in front of the New York Hilton Midtown hotel and waits for several minutes.{{Cite news |last1=Swanson |first1=Stephen |last2=Czachor |first2=Emily Mae |last3=Moore |first3=Jessica |last4=Kramer |first4=Marcia |last5=Duddridge |first5=Natalie |last6=Breen |first6=Kerry |date=December 4, 2024 |title=Timeline of the killing of UnitedHealth CEO Brian Thompson |url=https://www.cbsnews.com/minnesota/news/united-health-ceo-brian-thompson-killing-timeline/ |access-date=December 5, 2024 |work=WCCO-TV |archive-date=December 7, 2024 |archive-url=https://web.archive.org/web/20241207023419/https://www.cbsnews.com/minnesota/news/united-health-ceo-brian-thompson-killing-timeline/ |url-status=live}}
• 6:40 a.m. – Thompson leaves the Marriott hotel (at 151 W 54th St) he stayed at the prior night, heading toward the New York Hilton Midtown hotel.
• 6:44 a.m. – Thompson walks along the sidewalk toward the New York Hilton Midtown hotel and the assailant shoots him multiple times, racking his pistol after it appeared to jam; the suspect immediately flees northbound via a pedestrian walkway.{{Cite news |last=Debusmann |first=Bernd Jr. |date=May 12, 2024 |title=New photos released as NYPD hunt insurance boss killer |url=https://www.bbc.com/news/articles/c7ve36zg0e5o |access-date=December 5, 2024 |work=BBC News |archive-date=December 5, 2024 |archive-url=https://web.archive.org/web/20241205022336if_/https://www.bbc.com/news/articles/c7ve36zg0e5o |url-status=live}}
• 6:46 a.m. – Police respond to a 911 call reporting that a person has been shot.
• 6:48 a.m. – Officers arrive on scene and find Thompson with multiple gunshot wounds to his back and leg; he is taken to the hospital.
  Assailant is seen riding an electric bicycle north into Central Park.
• 6:59 a.m. – A person appearing to be the suspect is seen riding a bike on West 85th St.
• 7:04 a.m. – Suspect gets into a northbound taxi on 86th Street and Amsterdam Avenue.
• 7:12 a.m. – Thompson is declared dead at Mt. Sinai Hospital.
• 7:30 a.m. – Suspect arrives at George Washington Bridge Bus Station.

{{Clear}}

File:Killing of Brian Thompson suspect FBI seeking information poster.png seeking information poster]]

Three fired cartridge cases alongside three unfired cartridges were found at the scene. The words "delay", "deny", and "depose" were written on the cases. "Depose" was inscribed on a casing from a round fired into Thompson, while "delay" was marked on an unfired cartridge ejected as the shooter appeared to be clearing a jam.{{multiref|{{Cite news |first1=Minyvonne |last1=Burke |first2=Tim |last2=Stelloh |first3=Tom |last3=Winter |first4=Jonathan |last4=Dienst |date=2024-12-07 |title=What we know about UnitedHealthcare CEO's fatal shooting outside NYC hotel |url=https://www.nbcnews.com/news/us-news/unitedhealthcare-ceo-shooting-brian-thompson-suspect-what-know-rcna183155 |access-date=2024-12-12 |work=NBC News }}|{{cite news |last1=Williams |first1=Ashley R. |last2=Luhby |first2=Tami |last3=Duffy |first3=Clare |title='Delay,' 'deny' and 'depose' written on ammunition found after killing of health care CEO, NYPD says |url=https://www.cnn.com/us/live-news/brian-thompson-unitedhealthcare-news-12-6-24#cm4dfpl1800003b6mh8llcbm4 |work=CNN |access-date=December 16, 2024 |date=December 7, 2024 |archive-date=December 14, 2024 |archive-url=https://web.archive.org/web/20241214001319/https://www.cnn.com/us/live-news/brian-thompson-unitedhealthcare-news-12-6-24/#cm4dfpl1800003b6mh8llcbm4 |url-status=live}}|{{cite news |title=Police clarify bullet language |url=https://apnews.com/live/unitedhealthcare-ceo-brian-thompson-updates-day-3#00000193-9e4f-d530-a99f-becfd2f10000 |work=Associated Press |access-date=December 16, 2024 |date=December 7, 2024 |archive-date=December 17, 2024 |archive-url=https://web.archive.org/web/20241217214601/https://apnews.com/live/unitedhealthcare-ceo-brian-thompson-updates-day-3#00000193-9e4f-d530-a99f-becfd2f10000 |url-status=live}}|{{cite press release |title=D.A. Bragg Announces Murder Indictment Of Luigi Mangione |url=https://manhattanda.org/d-a-bragg-announces-murder-indictment-of-luigi-mangione/ |website=Manhattan District Attorney's Office |access-date=19 December 2024 |date=17 December 2024 |quote=Two of the discharged shell casings had the words 'DENY' and 'DEPOSE' written on them, and the word 'DELAY' was written on a bullet, all found at the scene.}}}} The three words are similar to the phrase "delay, deny, defend", a well-known phrase in the insurance industry alluding to insurance companies' efforts to not pay out claims.{{Cite magazine |access-date=December 17, 2024 |url=https://newrepublic.com/article/189121/unitedhealthcare-brian-thompson-shooting-social-media-reaction|title=Why Many Americans Are Celebrating the UnitedHealthcare CEO's Murder |first=Matt |last=Ford |magazine=The New Republic|date=December 6, 2024}} Accordingly, police stated they were investigating whether the words suggest the killer's motive.{{Cite news |last1=Miller |first1=John |last2=Musa |first2=Amanda |last3=Riess |first3=Rebekah |last4=Goldman |first4=David |last5=Gingras |first5=Brynn |date=December 4, 2024 |title=Gunman at large after UnitedHealthcare CEO fatally shot in 'brazen targeted attack,' police say |url=https://www.cnn.com/2024/12/04/us/brian-thompson-united-healthcare-death/index.html |access-date=December 5, 2024 |work=CNN |archive-date=December 5, 2024 |archive-url=https://web.archive.org/web/20241205011449if_/https://www.cnn.com/2024/12/04/us/brian-thompson-united-healthcare-death/index.html |url-status=live}}

A water bottle, candy wrapper, and phone were recovered from the scene and are believed to be connected to the shooter. Police said they believed they found the shooter's backpack in Central Park on December 6, 2024.{{cite news |last1=Balsamo |first1=Michael |last2=Sisak |first2=Michael R. |title=Police found a backpack carried by gunman who killed UnitedHealthcare CEO |url=https://fox40.com/news/national-and-world-news/police-found-a-backpack-carried-by-gunman-who-killed-unitedhealthcare-ceo/ |work=KTXL |access-date=December 8, 2024 |date=December 6, 2024}} The backpack contained a Tommy Hilfiger jacket and Monopoly money.{{Cite news |last1=Katersky |first1=Aaron |last2=Crudele |first2=Mark |last3=Hutchinson |first3=Bill |last4=Haworth |first4=Jon |last5=Pereira |first5=Ivan |title=UnitedHealthcare CEO shooting latest: Suspect's backpack had Monopoly money: Sources |url=https://abcnews.go.com/US/unitedhealthcare-ceo-shooting-latest-manhunt-nationwide-police-learn/story?id=116551771 |access-date=December 8, 2024 |work=ABC News |date=December 7, 2024 |archive-date=December 8, 2024 |archive-url=https://web.archive.org/web/20241208012216/https://abcnews.go.com/US/unitedhealthcare-ceo-shooting-latest-manhunt-nationwide-police-learn/story?id=116551771 |url-status=live}}

The New York City Police Department offered a reward up to $10,000 for information about the shooter on December 4, 2024.{{cite news |title=$10,000 reward offered for information on UnitedHealthcare CEO shooting: NYPD |first1=Emily |last1=Rahhal |first2=Erin |last2=Pflaumer |url=https://www.kxan.com/news/10000-reward-offered-for-information-on-unitedhealthcare-ceo-shooting-nypd/ |work=KXAN-TV |access-date=December 7, 2024 |date=December 4, 2024}} The following day, authorities released images of a suspect taken by surveillance cameras at the hostel and a Starbucks café.{{Cite news |last=Offenhartz |first=Jake |date=December 5, 2024 |title=The Latest: Gunman who killed UnitedHealthcare CEO had message on ammunition, AP source says |url=https://apnews.com/live/united-healthcare-ceo-brian-thompson-updates#00000193-9810-d3f9-a99f-f81b26360000 |access-date=December 5, 2024 |work=Associated Press |archive-date=December 6, 2024 |archive-url=https://web.archive.org/web/20241206074558if_/https://apnews.com/live/united-healthcare-ceo-brian-thompson-updates#00000193-9810-d3f9-a99f-f81b26360000 |url-status=live}} Two stills show the suspect's face, including one with him smiling widely at a female desk attendant at the hostel.{{cite news |first1=Karina |last1=Tsui |first2=Mark |last2=Morales |first3=Brynn |last3=Gingras |first4=John |last4=Miller |first5=Shimon |last5=Prokupecz |first6=Elise |last6=Hammond |first7=Tori B. |last7=Powell |first8=Ashley R. |last8=Williams |title=Police believe suspect in killing of UnitedHealthcare CEO has left New York City |url=https://www.cnn.com/2024/12/06/us/brian-thompson-unitedhealthcare-gunman-search-hnk/index.html |date=December 6, 2024 |work=CNN |access-date=December 6, 2024 |archive-date=December 6, 2024 |archive-url=https://web.archive.org/web/20241206072851if_/https://www.cnn.com/2024/12/06/us/brian-thompson-unitedhealthcare-gunman-search-hnk/index.html |url-status=live}}{{Cite news |last1=Katersky |first1=Aaron |last2=Shapiro |first2=Emily |last3=Cohen |first3=Miles |last4=Brennan |first4=David |date=December 5, 2024 |title=UnitedHealthcare CEO shooting latest: New photos of suspect's face released |url=https://abcnews.go.com/US/police-piece-unitedhealthcare-ceo-shooting-suspects-escape-route/story?id=116475329 |access-date=December 5, 2024 |work=ABC News |archive-date=December 5, 2024 |archive-url=https://web.archive.org/web/20241205161234/https://abcnews.go.com/US/police-piece-unitedhealthcare-ceo-shooting-suspects-escape-route/story?id=116475329 |url-status=live}} Sources told CBS the front desk worker asked to "see his pretty smile."{{Cite news |last1=Anderson |first1=Renee |last2=Bauman |first2=Ali |last3=Capellini |first3=Jeff |date=December 11, 2024 |title=Shell casings, fingerprints link UnitedHealthcare CEO murder suspect Luigi Mangione to crime scene, NYPD says |url=https://www.cbsnews.com/newyork/news/unitedhealthcare-ceo-murder-luigi-mangione-fingerprints/ |url-status=live |archive-url=https://web.archive.org/web/20241211202803/https://www.cbsnews.com/newyork/news/unitedhealthcare-ceo-murder-luigi-mangione-fingerprints/ |archive-date=December 11, 2024 |access-date=December 12, 2024 |work=CBS News |location=New York City}} The FBI joined the investigation and separately offered a reward of up to $50,000 for information leading to an arrest and conviction.{{cite news|url=https://apnews.com/article/unitedhealthcare-ceo-manhattan-shooting-death-dee5ad726a345a8209ecc0df7e44756e|last1=Balsamo|first1=Michael|last2=Sisak|first2=Michael R.|title=FBI offers $50,000 reward for information about gunman who killed UnitedHealthcare's CEO|date=December 7, 2024|publisher=Associated Press|access-date=December 7, 2024|archive-date=December 7, 2024|archive-url=https://web.archive.org/web/20241207061610/https://apnews.com/article/unitedhealthcare-ceo-manhattan-shooting-death-dee5ad726a345a8209ecc0df7e44756e|url-status=live}}

The shooter was described by police as a white man, approximately {{cvt|6|ft|1|in|cm}} tall, wearing a light brown or cream-colored hooded jacket, dark pants, and black sneakers with white soles. He had a gray backpack and concealed his face with a black face mask.{{Cite news |last=Hawkinson |first=Katie |date=December 5, 2024 |title=Who is Brian Thompson – the slain CEO of UnitedHealthcare? |url=https://www.independent.co.uk/news/world/americas/crime/brian-thompson-net-worth-united-healthcare-ceo-b2659222.html |access-date=December 5, 2024 |work=The Independent}}{{Cite news |last=Sherwood |first=Ben |date=December 5, 2024 |title=Who Is the E-Bike Assassin Who Killed UnitedHealthcare CEO Brian Thompson? |url=https://www.thedailybeast.com/who-is-the-citi-bike-assassin-who-killed-unitedhealthcare-ceo-brian-thompson-in-new-york/ |access-date=December 5, 2024 |work=The Daily Beast}} Police said the suspect appeared to be proficient in the use of firearms and was described as being "extremely camera savvy".{{Cite news |last=Newman |first=Andy |date=December 5, 2024 |title=Suspect in Killing of Insurance C.E.O. Is Said to Have Used Fake New Jersey ID |url=https://www.nytimes.com/live/2024/12/05/nyregion/brian-thompson-unitedhealthcare-news/fc6133de-cd38-5a81-a4ee-8d14aa656db9 |work=The New York Times |quote=One of investigators' main goals remains finding a surveillance image of the suspected shooter where his face is entirely unobscured, a senior law enforcement official said, describing the man as extremely camera savvy. Even in the pictures released earlier today, the man the police are seeking is wearing a hood. |access-date=December 6, 2024 |archive-date=December 8, 2024 |archive-url=https://web.archive.org/web/20241208063400/https://www.nytimes.com/live/2024/12/05/nyregion/brian-thompson-unitedhealthcare-news/fc6133de-cd38-5a81-a4ee-8d14aa656db9 |url-status=live}}

{{main|Luigi Mangione}}

File:Luigi Mangione, hero of the people - Marseilles, France.jpg, France]]

Luigi Mangione was born in Towson, Maryland{{Cite web |last1=Smith |first1=Justin |last2=Fenton |first2=Brenna |date=December 9, 2024 |title=Luigi Mangione's sprawling family found success after patriarch's rise |url=https://www.thebaltimorebanner.com/community/criminal-justice/luigi-mangione-family-baltimore-towson-GPRMNCATXRGDJAUZXJQO6RHSHU/ |access-date=December 13, 2024 |website=The Baltimore Banner}} on May 6, 1998.{{Cite web |date=December 9, 2024 |title=Suspect in CEO killing is charged with murder. Records show he had California ties |first1=Richard |last1=Winton |first2=Terry |last2=Castleman |first3=Nathan |last3=Solis |first4=Salvador |last4=Hernandez |first5=Summer |last5=Lin |first6=Clara |last6=Harter |url=https://www.latimes.com/california/story/2024-12-09/united-healthcare-ceo-arrest-california-new-york-pennsylvania |access-date=December 11, 2024 |website=Los Angeles Times}}{{Cite web |first1=Jessica |last1=Parker |first2=Cai |last2=Pigliucci |title=Luigi Mangione: Tracing the privileged Baltimore family roots of suspected CEO killer |url=https://www.bbc.com/news/articles/crl3jkjxp75o |date=14 December 2024 |access-date=December 15, 2024 |website=BBC News |archive-date=December 15, 2024 |archive-url=https://web.archive.org/web/20241215165253/https://www.bbc.com/news/articles/crl3jkjxp75o |url-status=live}} He graduated from the University of Pennsylvania.{{Cite news |date=December 9, 2024 |first1=Michael |last1=Loria |first2=Chris |last2=Kenning |title='Shocked and devastated': Family of suspected United Healthcare killer speaks out |url=https://eu.usatoday.com/story/news/nation/2024/12/09/family-of-suspected-ceo-killer-speaks-out/76875436007/ |access-date=December 15, 2024 |work=USA Today |archive-date=December 10, 2024 |archive-url=https://web.archive.org/web/20241210080307/https://eu.usatoday.com/story/news/nation/2024/12/09/family-of-suspected-ceo-killer-speaks-out/76875436007/ |url-status=live}} Prior to his arrest, Mangione had no criminal record.{{Cite magazine |last=Alaimo |first=Kara |date=2024-12-13 |title=The Internet Missed the Point on Luigi Mangione |url=https://time.com/7201952/luigi-mangione-internet-myths-essay/ |access-date=2024-12-20 |magazine=TIME}} His last known residence was in Honolulu, Hawaii.{{cite web |last1=Katersky |first1=Aaron |last2=Crudele |first2=Mark |last3=Margolin |first3=Josh |last4=Deliso |first4=Meredith |date=December 11, 2024 |title=What we know about Luigi Mangione, Ivy League grad charged in CEO's murder |url=https://abcnews.go.com/US/unitedhealthcare-ceo-shooting-suspect/story?id=116460289 |access-date=December 11, 2024 |website=ABC News |archive-date=December 14, 2024 |archive-url=https://web.archive.org/web/20241214023304/https://abcnews.go.com/US/unitedhealthcare-ceo-shooting-suspect/story?id=116460289 |url-status=live}} In November 2024, Mangione was reported missing by his mother, who said the family had not heard from him since July of that year.{{Cite web |last1=Skene |first1=Lea |last2=Kelleher |first2=Jennifer Sinco |date=December 13, 2024 |title=Back trouble and brain fog bothered suspect in UnitedHealthcare CEO killing, his posts show |url=https://apnews.com/article/luigi-mangione-back-surgery-mental-health-35086d2e01089f53db7b95e7b6c683e4 |url-status=live |access-date=December 13, 2024 |website=Associated Press |archive-url=https://web.archive.org/web/20241213020311/https://apnews.com/article/luigi-mangione-back-surgery-mental-health-35086d2e01089f53db7b95e7b6c683e4 |archive-date=December 13, 2024}}

{{wikisource|Luigi Mangione federal complaint}}

Local police in Altoona, Pennsylvania, arrested Mangione on December 9, 2024, at a McDonald's restaurant in the city. An employee there called the police to say that a customer recognized the suspect from images released by the NYPD.{{Cite web |date=December 10, 2024 |title=Luigi Mangione 'went missing' after back surgery as friends reveal health issues |url=https://www.independent.co.uk/news/world/americas/crime/luigi-mangione-spondylolisthesis-back-pain-reddit-surgery-b2662396.html |first=James |last=Liddell |access-date=December 10, 2024 |website=The Independent |archive-date=December 13, 2024 |archive-url=https://web.archive.org/web/20241213062554/https://www.independent.co.uk/news/world/americas/crime/luigi-mangione-spondylolisthesis-back-pain-reddit-surgery-b2662396.html |url-status=live}}{{cite web |first=Ricky |last=Sayer |url=https://www.cbsnews.com/pittsburgh/news/luigi-mangione-arrest-altoona-pennsylvania-mcdonalds-reaction/ |title=Luigi Mangione's arrest in Altoona McDonald's baffles residents: 'Here of all places' |work=CBS News |date=December 10, 2024 |access-date=December 12, 2024}} Altoona is about {{Convert|280|mi|km}} west of New York City.{{Cite news |last1=Parker |first1=Jessica |last2=Sheerin |first2=Jude |date=December 9, 2024 |title=Luigi Mangione charged with murdering healthcare CEO in New York |url=https://www.bbc.com/news/articles/cly2zwqqr1ro |access-date=December 10, 2024 |work=BBC News |archive-date=December 10, 2024 |archive-url=https://web.archive.org/web/20241210061237/https://www.bbc.com/news/articles/cly2zwqqr1ro |url-status=live}} In his bag they found a 3D-printed gun and a 3D-printed suppressor, which the police said are consistent with the weapon used in the shooting, and a falsified New Jersey driver's license with the same name as the one used by the alleged shooter to check into the Manhattan hostel.{{Cite AV media |url=https://www.youtube.com/live/OIa0aPOkhnE |title=LIVE: NYC Mayor Eric Adams holds press conference on UnitedHealthcare CEO shooting |date=December 9, 2024 |publisher=Associated Press |access-date=December 9, 2024 |via=YouTube}}{{cite news |date=December 9, 2024 |title=Investigators of C.E.O.'s Killing Are Questioning a Man in Pennsylvania |url=https://www.nytimes.com/live/2024/12/09/nyregion/uhc-ceo-murder-suspect |access-date=December 9, 2024 |work=The New York Times |archive-date=December 9, 2024 |archive-url=https://web.archive.org/web/20241209175838/https://www.nytimes.com/live/2024/12/09/nyregion/uhc-ceo-murder-suspect |url-status=live}}{{cite news |date=December 9, 2024 |title=Live updates: Man questioned in UnitedHealthcare CEO Brian Thompson killing had gun, silencer and fake ID |url=https://www.nbcnews.com/news/us-news/live-blog/live-updates-man-questioned-unitedhealthcare-ceo-brian-thompsons-shoot-rcna183160 |access-date=December 9, 2024 |work=NBC News}} The police also said that when they arrested Mangione, they found a three-page, 262-word handwritten document about the American healthcare system, which they characterized as a manifesto.{{cite news |author=Newman |first=Andy |date=December 9, 2024 |title=Suspect in Health Care C.E.O.'s Killing Charged With Murder |url=https://www.nytimes.com/live/2024/12/09/nyregion/unitedhealthcare-ceo-shooting-news/4fdeebf4-3a8c-5e3d-9aaf-ee420c56001b |newspaper=December 9, 2024 |publisher=CNN}}

Mangione was charged in Blair County, Pennsylvania, with carrying a gun without a license, forgery, falsely identifying himself to the authorities, and possessing "instruments of crime" on December 9, 2024.{{cite news |date=December 9, 2024 |title=Suspect in Health Care C.E.O.'s Killing Charged With Murder |url=https://www.nytimes.com/live/2024/12/09/nyregion/unitedhealthcare-ceo-shooting-news |url-status=live |archive-url=https://web.archive.org/web/20241210053315if_/https://www.nytimes.com/live/2024/12/09/nyregion/unitedhealthcare-ceo-shooting-news |archive-date=December 10, 2024 |access-date=December 10, 2024 |work=The New York Times}} He was arraigned at around 6 p.m. at Blair County Courthouse, pleaded not guilty to all the charges, and was denied bail.{{Cite web |date=December 9, 2024 |title=Luigi Mangione Questioned By Police At Blair County Courthouse |url=https://www.inkl.com/news/luigi-mangione-questioned-by-police-at-blair-county-courthouse |access-date=December 10, 2024 |website=inkl}}{{cite news |last1=Williams |first1=Ashley R. |last2=Pazmino |first2=Gloria |last3=Morales |first3=Mark |last4=Gingras |first4=Brynn |last5=Miller |first5=John |last6=Andone |first6=Dakin |date=December 9, 2024 |title=Suspect in killing of health care CEO arrested on gun charge in Pennsylvania, NYC top cop says |url=https://edition.cnn.com/2024/12/09/us/unitedhealthcare-ceo-brian-thompson-shooter-monday/index.html |url-status=live |archive-url=https://web.archive.org/web/20241209190410if_/https://edition.cnn.com/2024/12/09/us/unitedhealthcare-ceo-brian-thompson-shooter-monday/index.html |archive-date=December 9, 2024 |access-date=December 9, 2024 |work=CNN}} By the end of the day, he was charged in Manhattan with second-degree murder,{{efn|name=NYmurder}} three counts of illegal weapons possession, and forgery.{{Cite web |last=Bohannon |first=Molly |date=December 10, 2024 |title=What We Know About Luigi Mangione: Suspected UnitedHealthcare Shooter Found With 'Written Admissions,' Police Say |url=https://www.forbes.com/sites/mollybohannon/2024/12/10/what-we-know-about-luigi-mangione-suspected-unitedhealthcare-shooter-found-with-written-admissions-police-say/ |access-date=December 10, 2024 |website=Forbes}} He was held in the State Correctional Institution at Huntingdon, a close-security state correctional facility in Huntingdon County, Pennsylvania.{{Cite web |first=Steve |last=Bohnel |date=December 11, 2024 |title=Inside SCI-Huntingdon, the prison where Luigi Mangione is being held |url=https://www.post-gazette.com/news/crime-courts/2024/12/11/luigi-mangione-unitedhealthcare-ceo-huntingdon/stories/202412110077 |access-date=December 13, 2024 |website=Pittsburgh Post-Gazette |archive-url=https://web.archive.org/web/20241212113338/https://www.post-gazette.com/news/crime-courts/2024/12/11/luigi-mangione-unitedhealthcare-ceo-huntingdon/stories/202412110077 |archive-date=December 12, 2024 |url-status=live}}

Mangione hired Karen Friedman Agnifilo, former prosecutor at the Manhattan District Attorney's Office and former legal analyst with CNN, as his New York case defense attorney.{{Cite web |last=Collins |first=Kaitlan |date=December 14, 2024 |title=Luigi Mangione retains high-powered New York attorney as he faces second-degree murder charge |url=https://edition.cnn.com/2024/12/13/us/luigi-mangione-new-york-attorney-retained/index.html |access-date=December 14, 2024 |website=CNN}} On December 17, New York prosecutors charged him with first-degree murder as murder committed in furtherance of terrorism.{{efn|name=NYmurder}}{{cite web |last1=Dienst |first1=Jonathan |last2=Winter |first2=Tom |title=Luigi Mangione charged with murder as act of terrorism in UnitedHealthcare CEO killing |url=https://www.nbcnewyork.com/news/local/crime-and-courts/luigi-mangione-indictment-ceo-killing-extradition/6076319/ |website=NBC New York |access-date=December 18, 2024 |date=December 17, 2024}} This charge and indictment modified the murder charge with which he was already charged, as the charge of murder as an act of terrorism holds more weight than just a simple murder charge.{{Cite web |last=Peltz |first=Jennifer |date=December 18, 2024 |title=How New York prosecutors used a terrorism law in the charges against Luigi Mangione |url=https://apnews.com/article/unitedhealthcare-ceo-killing-luigi-mangione-terrorism-law-7fcb28dcc0106c980b6ecf4aa9cf682f |access-date=December 21, 2024 |website=Associated Press |archive-date=December 20, 2024 |archive-url=https://web.archive.org/web/20241220224719/https://apnews.com/article/unitedhealthcare-ceo-killing-luigi-mangione-terrorism-law-7fcb28dcc0106c980b6ecf4aa9cf682f |url-status=live }}{{Cite web |last1=Offenhartz |first1=Jake |last2=Peltz |first2=Jennifer |date=December 17, 2024 |title=Prosecutors charge suspect with killing UnitedHealthcare CEO as an act of terrorism |url=https://apnews.com/article/unitedhealthcare-ceo-killing-luigi-mangione-fccc9e875e976b9901a122bc15669425 |access-date=December 17, 2024 |website=Associated Press |archive-date=December 17, 2024 |archive-url=https://web.archive.org/web/20241217203738/https://apnews.com/article/unitedhealthcare-ceo-killing-luigi-mangione-fccc9e875e976b9901a122bc15669425 |url-status=live}} He was extradited to New York on December 19 and transferred to the Metropolitan Detention Center in Brooklyn following his first appearance in the Manhattan federal court.{{cite news|url=https://abc7ny.com/post/unitedhealthcare-ceo-killing-suspect-luigi-mangione-held-same-jail-diddy-following-1st-court-appearance/15680808/|title=CEO murder suspect Luigi Mangione held in same jail as Diddy following 1st court appearance|first1=Aaron|last1=Katersky|first2=Emily|last2=Shapiro|first3=Ariane|last3=Naity|publisher=ABC 7 New York|date=December 20, 2024|access-date=December 20, 2024|archive-date=December 20, 2024|archive-url=https://web.archive.org/web/20241220103345/https://abc7ny.com/post/unitedhealthcare-ceo-killing-suspect-luigi-mangione-held-same-jail-diddy-following-1st-court-appearance/15680808/|url-status=live}}{{cite news|url=https://www.bbc.com/news/articles/c24nrynq0elo|title=Luigi Mangione returns to New York to face federal charges in fatal shooting|first=Madeline|last=Halpert|publisher=BBC News|date=December 20, 2024|access-date=December 20, 2024|archive-date=December 20, 2024|archive-url=https://web.archive.org/web/20241220011443/https://www.bbc.com/news/articles/c24nrynq0elo|url-status=live}}{{cite news |last=Tucker |first=Emma |date=December 20, 2024 |title=How Luigi Mangione's notebook helped federal prosecutors build their case and what's next as he faces mounting charges |url=https://www.cnn.com/2024/12/20/us/luigi-mangione-notebook-trial-whats-next/index.html |accessdate=December 20, 2024 |work=CNN}} On December 23, Mangione pleaded not guilty to all New York state charges.{{cite web |last1=Reiss |first1=Adam |last2=Li |first2=David K. |title=Luigi Mangione pleads not guilty in killing of UnitedHealthcare CEO on N.Y. state charges |url=https://www.nbcnews.com/news/us-news/luigi-mangione-pleads-not-guilty-killing-unitedhealthcare-ceo-new-york-rcna185215 |access-date=23 December 2024 |website=NBC News|date=December 23, 2024 }}{{cite web |last=Fadulu |first=Lola |date=December 23, 2024 |title=Mangione Pleads Not Guilty in First N.Y. State Court Appearance |url=https://www.nytimes.com/2024/12/23/nyregion/luigi-mangione-arraignment.html |access-date=23 December 2024 |website=The New York Times}} In addition to the eleven state charges, he faces four new federal charges, including two counts of stalking, a new firearms-related offense, and murder through use of a modified firearm.{{cite web |last1=Bowman |first1=Emma |title=Federal murder charge against Mangione could mean death penalty in CEO killing |website=NPR |date=19 December 2024 |url=https://www.npr.org/2024/12/19/nx-s1-5234272/mangione-ceo-killing-charges-notebooks |access-date=20 December 2024}} On April 1, U.S. Attorney General Pam Bondi directed prosecutors to seek the death penalty in the federal case. The state charges carry a maximum sentence of life imprisonment.

Upon Mangione's arrest, police said they found in his possession a 262-word handwritten document, which many media outlets characterized as a "manifesto". According to NYPD commissioner Jessica Tisch, the handwritten document spoke to Mangione's "motivation and mindset".{{Cite news |date=December 9, 2024 |title=Suspect in Health Care C.E.O.'s Killing Charged With Murder |url=https://www.nytimes.com/live/2024/12/09/nyregion/unitedhealthcare-ceo-shooting-news |url-status=live |archive-url=https://web.archive.org/web/20241217004658/https://www.nytimes.com/live/2024/12/09/nyregion/unitedhealthcare-ceo-shooting-news |archive-date=December 17, 2024 |access-date=December 19, 2024 |work=The New York Times |language=en}}{{Cite web |last1=Sundby |first1=Alex |last2=Doyle |first2=John |last3=Ferris |first3=Layla |last4=Doan |first4=Laura |last5=Li |first5=Emma |last6=Breen |first6=Kerry |date=December 18, 2024 |title=What we know about Luigi Mangione, suspect charged in UnitedHealthcare CEO's killing |url=https://www.cbsnews.com/news/luigi-mangione-healthcare-ceo-shooting-what-we-know/ |access-date=January 5, 2025 |website=CBS}} Journalist Ken Klippenstein published a transcription of the document police said was found on Mangione. Police confirmed that the transcription was legitimate.{{Cite news |last=Klippenstein |first=Ken |author-link=Ken Klippenstein |date=December 10, 2024 |title=Exclusive: Luigi's Manifesto |url=https://www.kenklippenstein.com/p/luigis-manifesto |access-date=January 5, 2025 |archive-date=January 5, 2025 |archive-url=https://web.archive.org/web/20250105114623/https://www.kenklippenstein.com/p/luigis-manifesto |url-status=live }}{{cite web |last1=Montag |first1=Madison |title=Independent journalist releases copy of Luigi Mangione's manifesto |url=https://www.pennlive.com/crime/2024/12/independent-journalist-releases-copy-of-luigi-mangiones-manifesto.html |website=pennlive |access-date=17 January 2025 |language=en |date=11 December 2024}}{{Cite web |last=Novak |first=Matt |date=2024-12-10 |title='They Continue to Abuse Our Country for Immense Profit': Luigi Mangione's Alleged Manifesto Leaks Online |url=https://gizmodo.com/they-continue-to-abuse-our-country-for-immense-profit-luigi-mangiones-manifesto-leaks-online-2000536812 |access-date=2025-01-07 |website=Gizmodo |language=en-US}} The document reads as follows:

To the Feds, I'll keep this short, because I do respect what you do for our country. To save you a lengthy investigation, I state plainly that I wasn't working with anyone. This was fairly trivial: some elementary social engineering, basic CAD, a lot of patience. The spiral notebook, if present, has some straggling notes and To Do lists that illuminate the gist of it. My tech is pretty locked down because I work in engineering so probably not much info there. I do apologize for any strife of traumas but it had to be done. Frankly, these parasites simply had it coming. A reminder: the US has the #1 most expensive healthcare system in the world, yet we rank roughly #42 in life expectancy. United is the [indecipherable] largest company in the US by market cap, behind only Apple, Google, Walmart. It has grown and grown, but as [sic] our life expectancy? No the reality is, these [indecipherable] have simply gotten too powerful, and they continue to abuse our country for immense profit because the American public has allwed [sic] them to get away with it. Obviously the problem is more complex, but I do not have space, and frankly I do not pretend to be the most qualified person to lay out the full argument. But many have illuminated the corruption and greed (e.g.: Rosenthal, Moore), decades ago and the problems simply remain. It is not an issue of awareness at this point, but clearly power games at play. Evidently I am the first to face it with such brutal honesty.{{Cite web |last=Klippenstein |first=Ken |title=Exclusive: Luigi's Manifesto |url=https://www.kenklippenstein.com/p/luigis-manifesto |access-date=2025-01-16 |website=Kenklippenstein.com}}

The complaint filed by the U.S. Attorney's Southern District of New York calls the letter "The Feds Letter" because it is addressed "To the Feds."{{cite web |title=United States of America V. Luigi Nicholas Mangione; Sealed Complaint |url=https://www.justice.gov/d9/2024-12/signed_complaint_mangione.pdf |website=justice.gov |publisher=Department of Justice |access-date=23 December 2024 |archive-date=December 19, 2024 |archive-url=https://web.archive.org/web/20241219223033/https://www.justice.gov/d9/2024-12/signed_complaint_mangione.pdf |url-status=live }} The complaint was unsealed on December 19, 2024.{{cite press release |last1=Biase |first1=Nicholas |last2=Wratchford |first2=Shelby |date=December 19, 2024 |title=Luigi Mangione Charged With The Stalking And Murder Of UnitedHealthcare CEO Brian Thompson And Use Of A Silencer In A Crime Of Violence. |url=https://www.justice.gov/usao-sdny/pr/luigi-mangione-charged-stalking-and-murder-unitedhealthcare-ceo-brian-thompson-and-use |work=United States Attorney for the Southern District of New York |publisher=Department of Justice |access-date=2024-12-22 |archive-date=December 23, 2024 |archive-url=https://web.archive.org/web/20241223034944/https://www.justice.gov/usao-sdny/pr/luigi-mangione-charged-stalking-and-murder-unitedhealthcare-ceo-brian-thompson-and-use |url-status=live }}

As of mid-December 2024, investigators' theory of Mangione's motive is ill will towards the health insurance industry.{{Cite web |last1=Sundby |first1=Alex |last2=Ferris |first2=Layla |last3=Doan |first3=Laura |last4=Li |first4=Emma |last5=Doyle |first5=John |date=December 12, 2024 |title=What we know about Luigi Mangione, suspect charged in UnitedHealthcare CEO's killing |url=https://www.cbsnews.com/news/luigi-mangione-healthcare-ceo-shooting-what-we-know/ |access-date=December 13, 2024 |website=CBS News}} Police believe the motive was partially related to an injury that Mangione had suffered that caused him to visit the emergency room in July 2023. Online photos posted by Mangione showed screws in his back, though the identity of the person pictured is unverified.{{Cite web |last1=Kramer |first1=Marcia |last2=McNicholas |first2=Tim |date=December 10, 2024 |title=Luigi Mangione's motive for allegedly killing UnitedHealthcare's CEO is coming into focus, NYPD says |url=https://www.cbsnews.com/newyork/news/unitedhealthcare-ceo-murder-luigi-mangione-motive-nypd/ |url-status=live |archive-url=https://web.archive.org/web/20241213040014/https://www.cbsnews.com/newyork/news/unitedhealthcare-ceo-murder-luigi-mangione-motive-nypd/ |archive-date=December 13, 2024 |access-date=December 11, 2024 |work=CBS News}} Mangione wrote online that he had spondylolisthesis, a lower back condition.{{cite web |last1=Pugachevsky |first1=Julia |date=December 11, 2024 |title=Luigi Mangione had spondylolisthesis, a lower back condition. He wrote about painful symptoms like sciatica on Reddit. |url=https://www.yahoo.com/news/luigi-mangione-had-spondylolisthesis-lower-221331683.html |access-date=December 12, 2024 |website=Yahoo News |agency=Business Insider |archive-date=December 14, 2024 |archive-url=https://web.archive.org/web/20241214000849/https://www.yahoo.com/news/luigi-mangione-had-spondylolisthesis-lower-221331683.html |url-status=live}} Sources told CBS they believed Mangione had resentment towards UnitedHealthcare as well as other health insurance companies. According to UnitedHealthcare, he was not one of their customers. New York Police Chief of Detectives Joseph Kenny believes Mangione may have targeted them because of the company's size.{{Cite web |first1=Jonathan |last1=Dienst |first2=Kai |last2=Ma |first3=Phil |last3=Helsel |date=December 13, 2024 |title=Suspect in CEO's killing wasn't insured by UnitedHealthcare, company says |url=https://www.nbcnews.com/news/us-news/suspect-ceos-killing-was-not-insured-unitedhealthcare-company-says-rcna184069 |access-date=December 13, 2024 |website=NBC News |archive-date=December 13, 2024 |archive-url=https://web.archive.org/web/20241213185144/https://www.nbcnews.com/news/us-news/suspect-ceos-killing-was-not-insured-unitedhealthcare-company-says-rcna184069 |url-status=live}}

Police believe that Mangione was inspired, in part, by Ted Kaczynski's Industrial Society and Its Future.{{Cite news |last1=Katersky |first1=Aaron |last2=Charalambous |first2=Peter |last3=Margolin |first3=Josh |date=December 10, 2024 |title=UnitedHealthcare CEO shooting suspect inspired by Unabomber: NYPD analysis |url=https://abcnews.go.com/US/unitedhealthcare-ceo-shooting-suspect-inspired-unabomber-nypd-analysis/story?id=116653076 |url-status=live |archive-url=https://web.archive.org/web/20241210210344/https://abcnews.go.com/US/unitedhealthcare-ceo-shooting-suspect-inspired-unabomber-nypd-analysis/story?id=116653076 |archive-date=December 10, 2024 |access-date=December 11, 2024 |work=ABC News}} Mangione's account posted a Goodreads review of Industrial Society and Its Future,{{Cite web |date=January 23, 2024 |work=Goodreads |title=Luigi's Reviews > Industrial Society and Its Future |url=https://www.goodreads.com/review/show/4065667863 |access-date=December 12, 2024 |archive-date=December 12, 2024 |archive-url=https://web.archive.org/web/20241212140332/https://www.goodreads.com/review/show/4065667863?book_show_action=false |url-status=live}} describing Kaczynski as "rightfully imprisoned" and was critical of his use of violence against innocent individuals. The review, which gave the manifesto four out of five stars, also contained a quote that the reviewer claimed to have found online. The quote contained the lines {{" '}}Violence never solved anything' is a statement uttered by cowards and predators," and "When all other forms of communication fail, violence is necessary to survive."{{cite news |last=Pulver |first=Dinah Voyles |date=December 9, 2024 |title=4 Stars for the Unabomber: 'Person of interest' in CEO slaying reviewed killer's manifesto |url=https://www.usatoday.com/story/news/nation/2024/12/09/luigi-mangione-unabomber-four-star-review/76868674007/ |accessdate=December 10, 2024 |publisher=USA Today}}{{Cite web |date=December 9, 2024 |title=Who is Luigi Mangione — the man charged with murder of US executive Brian Thompson? |url=https://www.sbs.com.au/news/article/who-is-luigi-mangione-the-man-charged-with-murder-of-us-executive-brian-thompson/0ot67j1lt |access-date=December 10, 2024 |website=SBS News |agency=AFP, Reuters}}{{Cite magazine |last=Ferguson |first=Malcolm |date=December 9, 2024 |title=The Murky Right-Wing Politics of the Alleged UHC Shooter |url=https://newrepublic.com/post/189162/uhc-united-healthcare-shooter-what-we-know-right-wing-politics |access-date=December 9, 2024 |magazine=The New Republic |issn=0028-6583}}

A report on the killing by the New York City Police Department's Intelligence & Counterterrorism Bureau{{multiref2|{{cite news |last1=Cann |first1=Christopher |last2=Ortiz |first2=Jorge L. |title=Suspect in UnitedHealthcare CEO's killing fights extradition to New York: Updates |url=https://www.usatoday.com/story/news/nation/2024/12/10/luigi-mangione-unitedhealthcare-ceo-brian-thompson-shooter/76881755007/ |work=USA Today}}|{{cite news |last1=Marcius |first1=Chelsia Rose |title=Suspect in C.E.O.'s Killing Fights Extradition to New York |url=https://www.nytimes.com/live/2024/12/10/nyregion/unitedhealthcare-ceo-luigi-mangione |work=The New York Times |date=10 December 2024 |quote=An internal New York Police Department report obtained by The Times walks through parts of the three-page manifesto the suspect had at the time of his arrest and the potential for others to see him as "a martyr and an example to follow." The suspect "appeared to view the targeted killing of the company's highest-ranking representative as a symbolic takedown and a direct challenge to its alleged corruption and 'power games,' asserting in his note he is the 'first to face it with such brutal honesty,'" according to the intelligence analysis report drawn up by the Police Department's Intelligence and Counterterrorism Bureau.}}|{{cite news |last1=Tucker |first1=Emma |title=New York prosecutors may have trouble proving first-degree murder charge against Luigi Mangione, legal experts say |url=https://www.cnn.com/2024/12/18/us/luigi-mangione-murder-indictment-new-york/index.html |work=CNN |date=18 December 2024}}

}} was obtained by independent journalist Dan Boguslaw, and published in full by Klippenstein on December 26. The intelligence report focused on Mangione's motive and people who express sympathy for him, whom the bureau labeled as "extremists". The report assessed that Mangione was motivated by "what he perceives as a 'parasitic' health insurance company and industry as a whole, as well as broader objections to corporate greed and a concern for modern society".{{cite web |last1=Klippenstein |first1=Ken |last2=Boguslaw |first2=Dan |date=2024-12-26 |title=Read the NYPD's Mangione report the media won't publish |url=https://www.kenklippenstein.com/p/post-luigi-the-extremist-threat-is |access-date=28 December 2024 |website=kenklippenstein.com |publisher=}}

File:Deny Defend Depose.jpg

File:Deny Defend Depose, Miami Beach.jpg graffiti in Miami Beach]]

Many social media users expressed their contempt for Thompson, UnitedHealthcare, and the nation's health insurance system while expressing sympathy for and praising the assailant for his actions.{{cite news |last=Goldman |first=Maya |date=December 5, 2024 |title=UnitedHealth CEO's killing unleashes social media rage against insurers |url=https://www.axios.com/2024/12/05/unitedhealth-brian-thompson-killing-health-insurers-social-media |access-date=December 6, 2024 |work=Axios}}{{cite news |last=Novak |first=Matt |date=December 4, 2024 |title=Bitter Americans React to UnitedHealthcare CEO's Murder: 'My Empathy Is Out of Network' |url=https://gizmodo.com/bitter-americans-react-to-unitedhealthcare-ceos-murder-my-empathy-is-out-of-network-2000534520 |access-date=December 5, 2024 |work=Gizmodo}}{{cite news |last=Thalen |first=Mikael |date=December 4, 2024 |title=Grim memes highlight bleak state of insurance in wake of UnitedHealth CEO shooting |url=https://www.dailydot.com/debug/unitedhealth-ceo-brian-thompson-memes/ |access-date=December 5, 2024 |work=The Daily Dot |archive-date=December 5, 2024 |archive-url=https://web.archive.org/web/20241205140737/http://www.dailydot.com/debug/unitedhealth-ceo-brian-thompson-memes/ |url-status=live}}{{cite web |last1=Valinsky |first1=Jordan |title=1-star McDonald's reviews and sympathetic merch: Companies try to stop online support for CEO killer suspect |access-date=December 17, 2024 |url=https://edition.cnn.com/2024/12/10/business/deny-defend-dispose-merchandise-amazon-ceo-shooting/index.html |website=CNN |date=December 10, 2024 |archive-date=December 12, 2024 |archive-url=https://web.archive.org/web/20241212110350/https://edition.cnn.com/2024/12/10/business/deny-defend-dispose-merchandise-amazon-ceo-shooting/index.html |url-status=live}} Social media users shared stories of health insurance claim denials online,{{cite web |last1=Simmons-Duffin |first1=Selena |date=6 December 2024 |title=After a shocking shooting, Americans vent feelings about health insurance |url=https://www.npr.org/sections/shots-health-news/2024/12/06/nx-s1-5217736/brian-thompson-unitedhealthcare-ceo-social-media |access-date=17 January 2025 |website=NPR}}{{cite web |last1=Simmons-Duffin |first1=Selena |date=12 December 2024 |title=UHC murder suspect railed about U.S. health care. Here's what he missed |url=https://www.npr.org/sections/shots-health-news/2024/12/12/nx-s1-5224139/mangione-uhc-brian-thompson-shooting-health-care |access-date=17 January 2025 |website=NPR}}{{cite news |last1=Searcey |first1=Dionne |last2=Malone Kircher |first2=Madison |date=December 5, 2024 |title=Torrent of Hate for Health Insurance Industry Follows C.E.O.'s Killing |url=https://www.nytimes.com/2024/12/05/nyregion/social-media-insurance-industry-brian-thompson.html |url-status=live |archive-url=https://web.archive.org/web/20241206142054if_/https://www.nytimes.com/2024/12/05/nyregion/social-media-insurance-industry-brian-thompson.html |archive-date=December 6, 2024 |access-date=December 7, 2024 |work=The New York Times}} and joked about the killing with memes and gallows humor.{{Cite news |last=Glenza |first=Jessica |date=December 5, 2024 |title=Brian Thompson's killing sparks outrage over state of US healthcare |url=https://www.theguardian.com/us-news/2024/dec/05/unitedhealthcare-brian-thompson-killing-online-reaction |access-date=December 6, 2024 |work=The Guardian}} NBC News reported that the "main theme animating many of the posts about the Thompson killing was that UnitedHealthcare and other insurance companies harm and kill Americans by denying coverage in the name of profit".{{cite news |last1=Dilanian |first1=Ken |date=December 5, 2024 |title=Insurance executive's murder sparks online praise and hate |url=https://www.nbcnews.com/investigations/insurance-executives-murder-sparks-online-praise-hate-rcna183017 |url-status=live |archive-url=https://archive.today/20241206085429/https://www.nbcnews.com/investigations/insurance-executives-murder-sparks-online-praise-hate-rcna183017 |archive-date=December 6, 2024 |access-date=December 6, 2024 |work=NBC News}} One physician told The Daily Beast that they believed the perpetrator should be brought to justice, but they also stated that Thompson's role as CEO had led to a great amount of suffering and loss of life, which he described as "on the order of millions", adding that "[it is] hard for me to sympathize when so many people have suffered because of his company".{{Cite news |last=Craig |first=Sean |date=December 5, 2024 |title=Moderators Delete Reddit Thread as Doctors Torch Dead UnitedHealthcare CEO |url=https://www.thedailybeast.com/leading-medical-subreddit-deletes-thread-on-unitedhealthcare-ceos-murder-after-users-slam-his-record/ |access-date=December 7, 2024 |work=The Daily Beast |archive-date=December 7, 2024 |archive-url=https://web.archive.org/web/20241207020348if_/https://www.thedailybeast.com/leading-medical-subreddit-deletes-thread-on-unitedhealthcare-ceos-murder-after-users-slam-his-record/ |url-status=live}} Internet culture journalist Taylor Lorenz analyzed the responses on social media and wrote on her blog: "No, that does not mean people should murder them. But if you've watched a loved one suffer and die from insurance denial, it's normal to wish the people responsible would suffer the same fate."{{cite web |last1=Duffy |first1=Clare |last2=Luhby |first2=Tami |title=Killing of UnitedHealthcare CEO prompts flurry of stories on social media over denied insurance claims |url=https://edition.cnn.com/2024/12/06/business/insurance-claim-denials-unitedhealthcare-ceo/index.html |website=CNN |access-date=December 16, 2024 |date=December 6, 2024 |archive-date=December 6, 2024 |archive-url=https://web.archive.org/web/20241206185135/https://www.cnn.com/2024/12/06/business/insurance-claim-denials-unitedhealthcare-ceo/index.html |url-status=live}}

The shooter was called a folk hero and celebrated as a vigilante by some of the general public. He has been compared to Robin Hood{{cite news |date=17 December 2024 |access-date=30 December 2024 |work=The Globe and Mail |title=Luigi Mangione is one of many accused criminals who became seen as a folk hero |first=Ed |last=Butts |url=https://www.theglobeandmail.com/opinion/article-luigi-mangione-is-one-of-many-accused-criminals-who-became-seen-as-a/}} and the Dillinger Gang.{{cite news |title=Why the CEO Shooter Makes the Perfect American Folk Hero |first=Elliott |last=Gorn |date=Dec 18, 2024 |url=https://slate.com/news-and-politics/2024/12/luigi-mangione-manifesto-unitedhealthcare-ceo-brian-thompson.html |archive-date=December 19, 2024 |access-date=December 18, 2024 |archive-url=https://web.archive.org/web/20241219073643/https://slate.com/news-and-politics/2024/12/luigi-mangione-manifesto-unitedhealthcare-ceo-brian-thompson.html |url-status=live }} Look-alike contests have been held in New York City's Washington Square Park and at the University of Florida,{{Cite news |last=Edwards |first=Samantha |date=December 6, 2024 |title=The UnitedHealthcare CEO's killing united the internet with an eerie anti-capitalist catharsis |url=https://www.theglobeandmail.com/canada/article-unitedhealthcare-ceo-shooting-online-reaction/ |url-status=deviated |archive-url=https://archive.today/20241208050731/https://www.theglobeandmail.com/canada/article-unitedhealthcare-ceo-shooting-online-reaction/ |archive-date=December 8, 2024 |access-date=December 17, 2024 |work=The Globe and Mail |language=en-CA}}{{Cite web |last=Meko |first=Hurubie |date=December 7, 2024 |title=Some on Social Media See Suspect in C.E.O. Killing as a Folk Hero |url=https://www.nytimes.com/2024/12/07/nyregion/unitedhealthcare-ceo-shooting-suspect.html |url-status=live |archive-url=https://web.archive.org/web/20241207234142/https://www.nytimes.com/2024/12/07/nyregion/unitedhealthcare-ceo-shooting-suspect.html |archive-date=December 7, 2024 |access-date=December 17, 2024 |website=The New York Times}}{{Cite web |last=Castro |first=Sabrina |date=December 13, 2024 |title=Hundreds gather at UF for Luigi Mangione lookalike contest amid murder case |url=https://www.alligator.org/article/2024/12/uf-luigi-mangione-lookalike-contest |url-status=live |archive-url=https://web.archive.org/web/20241217200615/https://www.alligator.org/article/2024/12/uf-luigi-mangione-lookalike-contest |archive-date=December 17, 2024 |access-date=December 17, 2024 |website=The Independent Florida Alligator |language=en-US}} and "Wanted posters" of CEOs appeared in Manhattan.{{cite web |title='Wanted' CEO posters and other threats emerge after Mangione arrest |first1=Erik |last1=Ortiz |first2=Aria |last2=Bendix |date=12 December 2024 |url=https://www.nbcnews.com/news/us-news/wanted-posters-threats-mangione-arrest-unitedhealthcare-rcna183867 |access-date=19 December 2024 |website=nbcnews.com |publisher=NBC News |archive-date=December 19, 2024 |archive-url=https://web.archive.org/web/20241219194910/https://www.nbcnews.com/news/us-news/wanted-posters-threats-mangione-arrest-unitedhealthcare-rcna183867 |url-status=live }} In the wake of the assassination, folk artist Jesse Welles wrote a protest song called "United Health", highlighting the perceived commodification of healthcare and the challenges faced by patients, which went viral online.{{Cite magazine |title=Jesse Welles Eviscerates UnitedHealthcare in New Protest Song |magazine=Rolling Stone |date=December 12, 2024 |url=https://www.rollingstone.com/music/music-news/unitedhealthcare-song-jesse-welles-protest-song-1235202103/}}

The case has been compared to Joker and V for Vendetta, alluding to "ordinary citizens battling huge systems."{{cite web |date=2024-12-12 |title=In love with a killer: How the internet became obsessed with Luigi Mangione |url=https://english.elpais.com/usa/2024-12-12/in-love-with-a-killer-how-the-internet-became-obsessed-with-luigi-mangione.html |access-date=6 January 2025 |website=El Pais}} The Nation and The New Hampshire Gazette opined that the case falls into the anarchist tradition of propaganda of the deed.{{Cite news |last=Brennan |first=Caleb |date=2024-12-13 |title=What Luigi Mangione and Daniel Penny Are Telling Us About America |work=The Nation |url=https://www.thenation.com/article/society/luigi-mangione-daniel-penny-vigilantism/ |archive-url=https://web.archive.org/web/20250101035521/https://www.thenation.com/article/society/luigi-mangione-daniel-penny-vigilantism/ |archive-date=January 1, 2025 |access-date=2025-01-08 |language=en-US |issn=0027-8378 |url-status=live }}{{cite news |author= |date=December 27, 2024|title=The Gilded Age Returns, Complete With Propaganda of the Deed|url=https://www.nhgazette.com/2024/12/27/the-gilded-age-returnscomplete-with-propaganda-of-the-deed/|work=The New Hampshire Gazette|location= |publisher= |access-date=January 27, 2025}} Following his arrest, the McDonald's where Mangione was arrested was review bombed.{{cite web|url=https://www.cnn.com/2024/12/11/us/luigi-mangione-unitedhealthcare-arrest-explained/index.html|title=How suspect on the run in CEO's killing was recognized at a Pennsylvania McDonald's, hash brown in hand, and finally captured|work=CNN|last1=Sanchez |first1=Ray |last2=Miller |first2=John|url-status=live|date=December 11, 2024|access-date=December 11, 2024|archive-date=December 11, 2024|archive-url=https://archive.today/20241211114918/https://www.cnn.com/2024/12/11/us/luigi-mangione-unitedhealthcare-arrest-explained/index.html}}{{cite web |last1=Newman |first1=Andy |last2=Wilson |first2=Michael |last3=Bogel-Burroughsn |first3=Nicholas |date=December 9, 2024 |title=Suspect in Health Care C.E.O.'s Killing Charged With Murder |url=https://www.nytimes.com/live/2024/12/09/nyregion/unitedhealthcare-ceo-shooting-news |url-status=live |archive-url=https://archive.today/20241211034557/https://www.nytimes.com/live/2024/12/09/nyregion/unitedhealthcare-ceo-shooting-news |archive-date=December 11, 2024 |access-date=December 12, 2024 |newspaper=The New York Times}} Protests in support of Mangione have been held outside courts where he appeared.{{cite web |title=Luigi Mangione supporters gather outside Pa. courthouse: 'Murder for profit is terrorism' |url=https://www.pennlive.com/news/2024/12/luigi-mangione-supporters-gather-outside-pa-courthouse-murder-for-profit-is-terrorism.html |access-date=7 January 2025 |website=PennLive|date=December 19, 2024 }}{{cite web |title='Catalyst': Luigi Mangione's supporters brave 11-degree arctic blast to air healthcare grievances |url=https://abcnews.go.com/US/catalyst-luigi-mangiones-supporters-brave-11-degree-arctic/story?id=117064146 |website=abcnews.go.com |publisher=ABC News |access-date=7 January 2025}} Items and merchandise in support of Mangione were posted on Etsy, Amazon and other e-commerce sites before being removed.{{Cite web |last=Roberson |first=Evan |date=December 10, 2024 |title=The Alleged UnitedHealthcare Shooter Has Merch. A Lot of Merch. |url=https://www.vice.com/en/article/the-alleged-unitedhealthcare-shooter-has-merch-a-lot-of-merch/ |access-date=December 11, 2024 |website=VICE}}{{cite web |first=Stacey |last=Ritzen |url=https://www.mensjournal.com/news/gofundme-etsy-luigi-mangione |title=GoFundMe, Etsy Crack Down on Support of Luigi Mangione, Accused of Killing Healthcare CEO |work=Mens' Journal |date=December 10, 2024 |accessdate=December 11, 2024 |archive-date=December 11, 2024 |archive-url=https://web.archive.org/web/20241211184244/https://www.mensjournal.com/news/gofundme-etsy-luigi-mangione |url-status=live}}{{cite magazine |date=10 December 2024 |last1=Gilbert |first1=David |title=Luigi Mangione Is Everywhere |url=https://www.wired.com/story/the-internet-is-gripped-by-mangione-mania/ |magazine=Wired |access-date=December 14, 2024 |archive-date=December 14, 2024 |archive-url=https://web.archive.org/web/20241214023341/https://www.wired.com/story/the-internet-is-gripped-by-mangione-mania/ |url-status=live}} Street art, graffiti, and signs in support of Mangione appeared on buildings, streets, highways, and other places.{{cite web |first=Rhianna |last=Schmunk |date=15 December 2024 |title=3 reasons behind the unsettling glorification of Luigi Mangione |url=https://www.cbc.ca/news/world/luigi-mangione-tiktoks-glorification-explanation-1.7410769 |website=CBC |access-date=27 December 2024}}{{cite news |first=Michaela |last=Bramwell |title=People Are Sharing Pictures Of 'Deny, Defend, Depose' Signs And Graffiti They've Seen In Public, And It's Shocking |url=https://www.yahoo.com/news/following-luigi-mangiones-arrest-people-211344738.html | work=BuzzFeed News|via=Yahoo News |date=16 December 2024 |access-date=31 December 2024 }}{{cite web |last1=Ross |first1=Alexander Reid |title=Lost in the Luigi Mangione Fun House |url=https://newlinesmag.com/argument/lost-in-the-luigi-mangione-fun-house/ |website=New Lines Magazine |date=18 December 2024}} A billboard with the words "Free Luigi" was seen in Riverside County, California.{{cite web |title='Free Luigi Mangione' billboard in California |url=https://www.foxla.com/video/1561566 |website=FOX 11 Los Angeles |date=13 December 2024 |access-date=1 January 2025 }}

According to the Network Contagion Research Institute, since Mangione's arrest, variations of "#FreeLuigi" have been shared over 50,000 times on X. They found that "by some measures", engagement with posts about Thompson's killing on platforms such as X and Reddit "surpassed that of the assassination attempt against Donald Trump in July."{{cite web |title=The dark fandom behind CEO murder suspect Luigi Mangione |date=13 December 2024 |url=https://www.bbc.com/news/articles/cp8nk75vg81o |first1=Holly |last1=Honderich |first2=Mike |last2=Wendling |website=BBC News |access-date=December 17, 2024 |archive-date=December 17, 2024 |archive-url=https://web.archive.org/web/20241217141949/https://www.bbc.com/news/articles/cp8nk75vg81o |url-status=live}} The NCRI also found that out of the top ten most-engaged tweets that mention Thompson or UnitedHealth, six of the posts implicitly or explicitly supported the killing or criticized Thompson. Some highlighted comments called for class war.{{cite web |title=Praise for UnitedHealthcare CEO Assassination Goes Viral |date=5 December 2024 |url=https://networkcontagion.us/reports/praise-for-united-healthcare-ceo-assassination-goes-viral/ |url-status=live |archive-url=https://web.archive.org/web/20241207223550if_/https://networkcontagion.us/reports/praise-for-united-healthcare-ceo-assassination-goes-viral/ |archive-date=December 7, 2024 |access-date=November 6, 2024 |publisher=Network Contagion Research Institute}}

Zeynep Tufekci, sociologist and columnist for The New York Times, commented: "I’ve been studying social media for a long time, and I can’t think of any other incident when a murder in this country has been so openly celebrated." She further noted, "The concentration of extreme wealth in the United States has recently surpassed that of the Gilded Age", and compared the public reaction to the fatal shooting of Thompson to political violence during that time period, stating that "inequities of the era fueled political movements that targeted corporate titans, politicians, judges and others for violence".{{Cite news |last=Tufekci |first=Zeynep |date=December 6, 2024 |title=The Rage and Glee That Followed a C.E.O.'s Killing Should Ring All Alarms |url=https://www.nytimes.com/2024/12/06/opinion/united-health-care-ceo-shooting.html |url-status=live |archive-url=https://web.archive.org/web/20241209082255if_/https://www.nytimes.com/2024/12/06/opinion/united-health-care-ceo-shooting.html |archive-date=December 9, 2024 |access-date=December 9, 2024 |work=The New York Times}} Robert Pape, an expert in political violence at the University of Chicago, told The Guardian that the response of online commentators was indicative of Americans' growing acceptance of violence to settle civil disputes.

Crowdsourcing fundraisers were also started by supporters of Mangione to cover his legal costs on GoFundMe, before being removed.{{cite web|last1=Bhojwani|first1=Janhvi|last2=Goggin|first2=Ben|date=December 13, 2024|title=As GoFundMe pulls Luigi Mangione fundraisers, another platform is featuring one on its front page|url=https://www.nbcnews.com/tech/internet/gofundme-pulls-luigi-mangione-fundraisers-another-platform-featuring-o-rcna184044|accessdate=December 13, 2024|website=NBC News|archive-date=December 14, 2024|archive-url=https://web.archive.org/web/20241214011346/https://www.nbcnews.com/tech/internet/gofundme-pulls-luigi-mangione-fundraisers-another-platform-featuring-o-rcna184044|url-status=live}} Other social media users linked Mangione's jail commissary account soliciting donations for "snacks, sodas, an iPad, etc."{{cite web |last=Sundel |first=Jenna |date=December 12, 2024 |title=Why Luigi Mangione May Not Get $45,000 Donated to His Legal Defense |url=https://www.newsweek.com/luigi-mangione-gofundme-fundraiser-lawyer-advises-unitedhealth-ceo-1999988 |accessdate=December 12, 2024 |website=Newsweek |archive-date=December 13, 2024 |archive-url=https://web.archive.org/web/20241213092240/https://www.newsweek.com/luigi-mangione-gofundme-fundraiser-lawyer-advises-unitedhealth-ceo-1999988 |url-status=live}} Thomas Dickey, Mangione's defense attorney, commented on the crowdfunding campaign, saying: "The Supreme Court says all these rich billionaires can give all kind of money to candidates and that's 'free speech,' so maybe these people were exercising their right to free speech and saying that's the way they're supporting my client."{{cite web|first1=William|last1=Vaillancourt|title=Fans of Luigi Mangione Raise Tens of Thousands for His Defense|url=https://www.thedailybeast.com/fans-of-luigi-mangione-raise-tens-of-thousands-for-his-defense/|work=The Daily Beast|publisher=The Daily Beast Company LLC|date=December 10, 2024|access-date=December 11, 2024|archive-date=December 11, 2024|archive-url=https://web.archive.org/web/20241211120854/https://www.thedailybeast.com/fans-of-luigi-mangione-raise-tens-of-thousands-for-his-defense/|url-status=live}}

A GiveSendGo fundraiser has remained live,{{cite web |last1=Hutchinson |first1=Bill |date=December 15, 2024 |access-date=December 17, 2024 |title=Defense fund established by supporters of suspected CEO killer Luigi Mangione tops $100K |url=https://abcnews.go.com/US/supporters-suspected-ceo-killer-luigi-mangione-establish-defense/story?id=116718574 |website=ABC News |archive-date=December 16, 2024 |archive-url=https://web.archive.org/web/20241216032436/https://abcnews.go.com/US/supporters-suspected-ceo-killer-luigi-mangione-establish-defense/story?id=116718574 |url-status=live}} and as of May 2025, it has raised over {{US$|1 million|link=https://www.givesendgo.com/legalfund-ceo-shooting-suspect}} from crowdfunded donations.{{cite news |url=https://www.nbcnews.com/news/us-news/luigi-mangiones-legal-defense-fund-hits-1-million-donations-rcna205086 |title=Luigi Mangione's legal defense fund hits $1 million in donations |first=David K. |last=Li |date=May 6, 2025|work=NBC News}} Several donors have cited the "politicization" of the case and the use of the death penalty, due process, and their frustration with the healthcare system as their reasons for donating.{{cite web |last1=Mack |first1=M. B. |title=Anonymous Donor's $30K Gift to Luigi Mangione's Legal Fund Stating 'Due Process Is Lacking' Leaves Users in Shock |url=https://www.latintimes.com/anonymous-donors-30k-gift-luigi-mangiones-legal-fund-stating-due-process-lacking-leaves-576567 |website=Latin Times |language=en |date=24 February 2025}}{{cite web |title=Luigi Mangione fundraiser hits new milestone |url=https://www.newsweek.com/luigi-mangione-defense-fundraiser-brian-thompson-murder-2033907 |website=Newsweek |language=en |date=20 February 2025}} On February 14, 2025, Mangione's New York legal defense team created a website to provide information about his cases due to the "extraordinary volume of inquiries and outpouring of support". The site shared an official message from Mangione, who expressed his gratitude for the public's support, stating that "the support has transcended political, racial, and even class divisions".{{cite magazine |last=O'Neil |first=Lorena |date=14 February 2025 |title=LUIGI MANGIONE MAKES FIRST PUBLIC STATEMENT, LAUNCHES WEBSITE |url=https://www.rollingstone.com/culture/culture-news/luigi-mangione-website-statement-united-healthcare-ceo-1235268920/ |access-date=15 February 2025 |magazine=Rolling Stone}}{{cite web |title=Luigi Mangione shares first public message since arrest after CEO killing |url=https://www.independent.co.uk/news/world/americas/crime/luigi-mangione-latest-website-b2698736.html |website=The Independent |language=en |date=15 February 2025}}

File:UnitedHealth Facebook post (cropped).webp

After Thompson's death, UnitedHealthcare's parent company, UnitedHealth Group, published a statement on Facebook detailing the death and their official condolences. Though the post's comment section was deactivated, over 100,000 Facebook users responded to the post with a "Haha" (or "laughing") reaction.{{Cite news |last=Moye |first=David |date=December 6, 2024 |title=UnitedHealthcare's Facebook Post About Slain CEO Flooded With 'Haha' Reactions |url=https://www.huffpost.com/entry/unitedhealthcare-ceo-tribute-mocked-laughing-emojis_n_67534f84e4b0ced7879807a7 |access-date=December 7, 2024 |work=HuffPost |archive-date=December 7, 2024 |archive-url=https://web.archive.org/web/20241207165619if_/https://www.huffpost.com/entry/unitedhealthcare-ceo-tribute-mocked-laughing-emojis_n_67534f84e4b0ced7879807a7 |url-status=live}}{{cite web |title=UnitedHealth Group |url=https://www.facebook.com/unitedhealthgroup/posts/pfbid0M4M7Yeega6MUQfpH3xXKeRUFuzAEyEGbaBS7e6aQ4ywfFCv9pwxbF2UuFpHuBTpPl |website=Facebook.com |access-date=December 16, 2024 |archive-date=December 16, 2024 |archive-url=https://archive.today/20241216041537/https://www.facebook.com/unitedhealthgroup/posts/pfbid0M4M7Yeega6MUQfpH3xXKeRUFuzAEyEGbaBS7e6aQ4ywfFCv9pwxbF2UuFpHuBTpPl |url-status=bot: unknown }} UnitedHealth Group CEO Andrew Witty defended the company's claim denial practices in an internal video which was leaked after the fatal shooting of Thompson. Recorded on December 5, the day after Thompson's death, Witty emphasized the company's role in ensuring "safe and appropriate" care and that the insurance giant will continue to prevent "unnecessary care".{{Cite web |last=Keane |first=Isabel |date=December 9, 2024 |title=UnitedHealth CEO says insurer will continue to prevent 'unnecessary care' in leaked video |url=https://nypost.com/2024/12/09/us-news/unitedhealth-ceo-says-insurer-will-continue-to-prevent-unnecessary-care-in-leaked-video/ |url-status=live |archive-url=https://web.archive.org/web/20241209171817/https://nypost.com/2024/12/09/us-news/unitedhealth-ceo-says-insurer-will-continue-to-prevent-unnecessary-care-in-leaked-video/ |archive-date=December 9, 2024 |access-date=December 10, 2024}} Two months after the shooting, UnitedHealth hired a defamation law firm to take action against social media posts critical of the company.{{cite web |last1=Botros |first1=Alena |title=UnitedHealth hired a defamation law firm to go after social media posts criticizing the company |url=https://fortune.com/2025/02/10/unitedhealth-defamation-law-firm-social-media/ |website=Fortune |language=en}} Prosecutors alleged that the killing had scared 40 UHC executives into hiring bodyguards.{{Cite web|url=https://www.businessinsider.com/da-says-luigi-mangione-terrorist-because-unitedhealthcare-execs-felt-terrorized-2025-6|title=DA says 40 UnitedHealthcare execs got bodyguards, and one dyed her hair after Luigi Mangione killed CEO Brian Thompson|first=Haven|last=Orecchio-Egresitz|first2=Laura|last2=Italiano|website=Business Insider|date=June 4, 2025}}

The killing significantly contributed to "months of tumult" at UnitedHealthcare. The public response led to growing negative perceptions of the company, which former chief medical officer Archelle Georgiou said "gets in the way of innovation and collaboration". Since the killing, the company's stock fell from $610 a share to $308. The company faced multiple lawsuits{{cite web |last1=Lavietes |first1=Matt |title=UnitedHealthcare sued by shareholders over reaction to CEO's killing |url=https://www.cnbc.com/2025/05/08/unitedhealthcare-sued-by-shareholders-over-reaction-to-ceos-killing.html |website=CNBC |access-date=15 May 2025 |language=en |date=8 May 2025}} and investigations,{{cite web |title=UnitedHealth under criminal probe for possible Medicare fraud, WSJ reports |url=https://www.reuters.com/business/healthcare-pharmaceuticals/unitedhealth-under-criminal-probe-possible-medicare-fraud-wsj-reports-2025-05-14/ |website=Reuters |access-date=15 May 2025}} had a decrease in profits, and in May, Witty abruptly resigned.{{cite web |title=UnitedHealth Group lost half its value in 6 months. What the CEO shakeup may mean for its future |url=https://www.startribune.com/unitedhealth-group-lost-half-its-value-in-6-months-what-the-ceo-shakeup-may-mean-for-its-future/601350918 |website=startribune.com |publisher=Star Tribune |access-date=15 May 2025}}

UnitedHealthcare, Blue Cross Blue Shield, and CVS Health, which operates Aetna, all removed photographs and other information about their executive leadership from their websites following Thompson's killing.{{Cite news |last1=Niasse |first1=Amina |last2=Mishra |first2=Manas |date=December 5, 2024 |title=Healthcare industry rethinks risk after murder of UnitedHealth exec |url=https://www.reuters.com/business/healthcare-pharmaceuticals/healthcare-industry-rethinks-risk-after-murder-unitedhealth-exec-2024-12-05/ |access-date=December 7, 2024 |publisher=Reuters}}{{Cite news |last=Cole |first=Samantha |date=December 5, 2024 |title=Major Health Insurance Companies Take Down Leadership Pages Following Murder of United Healthcare CEO |url=https://www.404media.co/multiple-major-health-insurance-companies-take-down-leadership-pages-following-murder-of-united-healthcare-ceo/ |url-status=live |archive-url=https://archive.today/20241206025124/https://www.404media.co/multiple-major-health-insurance-companies-take-down-leadership-pages-following-murder-of-united-healthcare-ceo/ |archive-date=December 6, 2024 |access-date=December 6, 2024 |work=404 Media}} Managed care provider Centene cancelled their in-person investor's day which had been scheduled for December 12, and instead planned a virtual conference.{{Cite web |last=Merelli |first=Annalisa |date=December 6, 2024 |title=Centene cancels in-person investor's day event in wake of UnitedHealthcare CEO killing |url=https://www.statnews.com/2024/12/06/unitedhealthcare-ceo-shooting-sparks-heightened-security-health-insurers/ |url-status=live |archive-url=https://web.archive.org/web/20241206212738/https://www.statnews.com/2024/12/06/unitedhealthcare-ceo-shooting-sparks-heightened-security-health-insurers/ |archive-date=December 6, 2024 |access-date=December 11, 2024 |work=Stat News}} The days following Thompson's death saw a surge in inquiries about protective services and security for CEOs and corporate executives, according to private security firm Allied Universal.{{Cite news |last=Goldberg |first=Emma |date=December 6, 2024 |title=The 'Chilling' Fatal Shooting of a C.E.O. Has Business Leaders on Edge |url=https://www.nytimes.com/2024/12/06/business/brian-thompson-insurance-executives-threats.html |url-status=live |archive-url=https://web.archive.org/web/20241206110343if_/https://www.nytimes.com/2024/12/06/business/brian-thompson-insurance-executives-threats.html |archive-date=December 6, 2024 |access-date=December 6, 2024 |work=The New York Times}} One former health insurance executive was quoted by the Financial Times as saying that threats against health insurance companies are common, and that "We'd have times when you'd deny proton laser therapy for a kid with seizures and the parent would freak out."{{Cite news |last=Barnes |first=Oliver |date=December 6, 2024 |title=UnitedHealth shooting stokes mourning and glee on social media |url=https://www.ft.com/content/79673e16-254f-4125-938b-b1d28683314f |url-status=live |archive-url=https://archive.today/20241207043227/https://www.ft.com/content/79673e16-254f-4125-938b-b1d28683314f |archive-date=December 7, 2024 |access-date=December 6, 2024 |work=Financial Times}} Michael Sherman, the former chief medical officer at Point32Health, justified the concerns of health insurance executives, saying, "It doesn't seem paranoid to worry that someone who's had services denied that they may believe are important might be in an emotionally unstable state."

Public officials including Minnesota governor Tim Walz and Senator Amy Klobuchar expressed dismay and offered condolences to the family; Walz said that he knew Thompson.{{Cite news |last=Helsel |first=Phil |date=December 4, 2024 |title=Minnesota Gov. Walz, Sen. Klobuchar call killing of CEO tragic and horrifying |url=https://www.nbcnews.com/news/us-news/live-blog/united-healthcare-ceo-shooting-brian-thompson-live-updates-rcna182929/rcrd65188 |url-status=live |archive-url=https://web.archive.org/web/20241205053423/https://www.nbcnews.com/news/us-news/live-blog/united-healthcare-ceo-shooting-brian-thompson-live-updates-rcna182929/rcrd65188 |archive-date=December 5, 2024 |access-date=December 5, 2024 |publisher=NBC News}} Maryland state delegate Nino Mangione, cousin of Luigi Mangione said, "Our family is shocked and devastated by Luigi's arrest. We offer our prayers to the family of Brian Thompson, and we ask people to pray for all involved".{{Cite web |last=Sisak |first=Michael R. |date=December 9, 2024 |title=Mangione's family releases statement following his arrest |url=https://apnews.com/live/unitedhealthcare-ceo-brian-thompson-updates-day-6#00000193-ae02-d3f9-a99f-fe0bd7600000 |url-status=live |archive-url=https://web.archive.org/web/20241209220941/https://apnews.com/live/unitedhealthcare-ceo-brian-thompson-updates-day-6#00000193-ae02-d3f9-a99f-fe0bd7600000 |archive-date=December 9, 2024 |access-date=December 10, 2024 |website=Associated Press}}

Outgoing White House Press Secretary Karine Jean-Pierre said that the government said that "violence to combat any sort of corporate greed is unacceptable".{{cite web |first=Joey |last=Garrison |date=10 December 2024 |title=White House condemns violence targeting 'corporate greed' after Luigi Mangione arrest |url=https://www.usatoday.com/story/news/politics/2024/12/10/white-house-condemns-violence-targeting-corporate-greed/76899006007/ |website=usatoday.com |publisher=USA Today |access-date=22 December 2024 |archive-date=December 20, 2024 |archive-url=https://web.archive.org/web/20241220113306/https://www.usatoday.com/story/news/politics/2024/12/10/white-house-condemns-violence-targeting-corporate-greed/76899006007/ |url-status=live }} Pennsylvania Governor Josh Shapiro commented that "Some attention in this case, especially online, has been deeply disturbing, as some have looked to celebrate instead of condemning this killer."{{cite web |date=10 December 2024 |last1=Woodward |first1=Sam |title=Pennsylvania governor: Reactions to slain UHC CEO are 'deeply disturbing.' |url=https://www.usatoday.com/story/news/nation/2024/12/10/uhc-ceo-killer-pa-gov-shapiro-reacts/76889283007/ |url-status=live |archive-url=https://web.archive.org/web/20241214001632/https://www.usatoday.com/story/news/nation/2024/12/10/uhc-ceo-killer-pa-gov-shapiro-reacts/76889283007/ |archive-date=December 14, 2024 |access-date=December 17, 2024 |website=USA TODAY}} At the time President-elect Donald Trump also condemned the killing and called celebration of Mangione "a sickness".{{cite web |first=Bryan |last=Metzger |title=Trump says it's 'terrible' that some people are valorizing Luigi Mangione: 'That's a sickness, actually' |url=https://www.businessinsider.com/donald-trump-luigi-mangione-terrible-shooting-unitedhealthcare-2024-12 |date=16 December 2024 |website=Business Insider |access-date=22 December 2024 |archive-date=December 19, 2024 |archive-url=https://web.archive.org/web/20241219153831/https://www.businessinsider.com/donald-trump-luigi-mangione-terrible-shooting-unitedhealthcare-2024-12 |url-status=live }} Outgoing Department of Homeland Security secretary Alejandro Mayorkas said that social media rhetoric about the killing was alarming, and that "It speaks of what is really bubbling here in this country, and unfortunately we see that manifested in violence, the domestic violent extremism that exists".{{cite web |first=Kaia |last=Hubbard |date=22 December 2024 |title=DHS secretary calls social media rhetoric following UnitedHealthcare CEO killing 'extraordinarily alarming' |url=https://www.cbsnews.com/news/alejandro-mayorkas-brian-thompson-united-healthcare-ceo-killing-alarming/ |website=CBS News |access-date=23 December 2024}}{{cite web |first=Gareth |last=Evans |date=22 December 2024 |title=Heroism attributed to CEO murder suspect is alarming - Mayorkas |url=https://www.bbc.com/news/articles/c4gp9ejk40no |website=BBC News |access-date=23 December 2024}}

California Democratic House representative Ro Khanna said, "There is no justification for violence" and added that the public reaction to Thompson's killing did not surprise him because "We waste hundreds of billions a year on health care administrative expenses that make insurance CEOs and wealthy stockholders incredibly rich while 85 million Americans go uninsured or underinsured".{{Cite web |last=Walter |first=Kate |date=December 8, 2024 |title=Rep. Ro Khanna: US should be moving toward Medicare for all to cure inequities |url=https://abcnews.go.com/Politics/rep-ro-khanna-us-moving-medicare-cure-inequities/story?id=116564621 |url-status=live |archive-url=https://web.archive.org/web/20241209020008/https://abcnews.go.com/Politics/rep-ro-khanna-us-moving-medicare-cure-inequities/story?id=116564621 |archive-date=December 9, 2024 |access-date=December 8, 2024 |publisher=ABC News}} Massachusetts Democratic Senator Elizabeth Warren stated, "The visceral response from people across this country who feel cheated, ripped off, and threatened by the vile practices of their insurance companies should be a warning to everyone in the health care system. Violence is never the answer, but people can be pushed only so far."{{cite news |last=Bobic |first=Igor |date=December 11, 2024 |title='This Is A Warning': Warren, Sanders Address Sympathy For UnitedHealthcare CEO Killing |url=https://www.huffpost.com/entry/warren-sanders-brian-thompson-health-care_n_6758bc0fe4b063b52a9a524b |url-status=live |archive-url=https://web.archive.org/web/20241211213259/https://www.huffpost.com/entry/warren-sanders-brian-thompson-health-care_n_6758bc0fe4b063b52a9a524b |archive-date=December 11, 2024 |access-date=December 11, 2024 |work=huffpost.com}} New York Democratic Representative Alexandria Ocasio-Cortez said, "This is not to say that an act of violence is justified, but I think for anyone who is confused or shocked or appalled, they need to understand that people interpret and feel and experience denied claims as an act of violence against them."{{cite news |last1=Ventura |first1=Juliann |date=December 12, 2024 |title=Alexandria Ocasio Cortez: People experience denied claims as 'act of violence' |url=https://thehill.com/policy/healthcare/5037584-ocasio-cortez-people-experience-denied-claims-as-act-of-violence/ |url-status=live |archive-url=https://web.archive.org/web/20241213213939/https://thehill.com/policy/healthcare/5037584-ocasio-cortez-people-experience-denied-claims-as-act-of-violence/ |archive-date=December 13, 2024 |access-date=December 13, 2024 |work=The Hill}} Vermont senator Bernie Sanders condemned the killing, but said the public response showed that many people were angry at health insurance companies and their practices.{{cite interview |first=Bernie |last=Sanders |author-link=Bernie Sanders |interviewer=Chandler Dandridge |title=Bernie Sanders: A Mass Movement Can Beat Health CEO Greed |url=https://jacobin.com/2024/12/sanders-movement-health-care-mangione |work=Jacobin |date=11 December 2024 |access-date=25 December 2024}} Oregon senator Ron Wyden commented that "I've long said violence, murder, are always unacceptable, always. But I think that there is a context, you know, here that is hugely important".{{cite web |first=Nathaniel |last=Weixel |title=Will anger at health insurers spur action? Democrats pessimistic |url=https://thehill.com/policy/healthcare/5040261-congress-health-insurance-reform/ |website=The Hill |date=December 15, 2024 |access-date=25 December 2024}}

An Emerson College poll surveyed 1,000 American registered voters about the Thompson killing between December 11 and 13, 2024. The poll found that a majority (68%) of voters viewed the actions of the suspected killer as unacceptable. Among young voters aged 18–29, 41% found the killing "acceptable or somewhat acceptable", while 40% in the same age group did not.{{cite web |last1=Timotija |first1=Filip |title=41 percent of young voters find killing of UnitedHealthcare CEO acceptable |url=https://thehill.com/policy/healthcare/5044269-poll-finds-41-percent-find-killing-unacceptable/ |website=The Hill |date=17 December 2024 |access-date=1 January 2025 }}{{cite web |last1=Daher |first1=Natalie |title=41% of young voters say UnitedHealthcare CEO killing 'acceptable': Poll |url=https://www.axios.com/2024/12/17/united-healthcare-ceo-killing-poll |website=Axios |access-date=December 18, 2024 |date=December 17, 2024}}

NORC at the University of Chicago conducted a poll of 1,001 American adults between December 12 to 16. When asked about the factors contributing to Thompson's death, 78 percent of respondents said the killer has "a great deal or a moderate amount of responsibility". A majority of respondents said that denials for health care coverage by insurance companies (69%) or the profits made by health insurance companies (67%) bore a "great deal or moderate amount" of responsibility for Thompson's death. A majority of respondents (53%) also said "wealth or income inequality in general" shared a "great deal or moderate amount" of responsibility for the killing. Young Americans were the age group least likely to say that the killer was responsible for the killing.{{cite news |first1=Linley |last1=Sanders |first2=Tom |last2=Murphy |first3=Amelia |last3=Thomson-DeVeaux |title=Most Americans blame insurance profits and denials alongside the killer in UHC CEO death, poll finds |url=https://apnews.com/article/luigi-mangione-unitedhealthcare-brian-thompson-shooting-b53fde08980d160ee93fd08b1664108d |work=Associated Press |date=27 December 2024}}{{cite web |last1=Rubin |first1=April |title=Most Americans think insurance industry bears some blame for CEO killing |url=https://www.axios.com/2024/12/27/brian-thompson-killing-responsibility-survey-healthcare-insurance |website=Axios |date=27 December 2024 |access-date=1 January 2025 }}

An Economist/YouGov poll conducted from December 15 to 17 surveying 1,553 U.S. adult citizens found that 43% of American citizens had a "somewhat unfavorable or very unfavorable" view of Mangione, while 21% had a "somewhat favorable or very favorable view of him." Mangione received the most support from citizens aged 18–29 and "very liberal" citizens. He was viewed least favorably by citizens aged 65 and older and "very conservative" citizens.{{cite web |last1=Frankovic |first1=Kathy |last2=Montgomery |first2=David |date=December 18, 2024 |title=Presidential pardons, billionaires, and Luigi Mangione: December 15-17, 2024 Economist/YouGov Poll |url=https://today.yougov.com/politics/articles/51189-presidential-pardons-billionaires-and-luigi-mangione-december-15-17-2024-economistyougov-poll |url-status=live |archive-url=https://web.archive.org/web/20241219012423/https://today.yougov.com/politics/articles/51189-presidential-pardons-billionaires-and-luigi-mangione-december-15-17-2024-economistyougov-poll |archive-date=December 19, 2024 |access-date=December 18, 2024 |website=YouGov}}

A December 12, 2024, online poll of 1,000 registered voters in the US taken by conservative Republican pollster Scott Rasmussen/RMG Research, Inc. found that 53% of respondents view the Thompson killer as a "villain", while 10% view the killer as a "hero". The poll found that younger voters, Progressive Democrats, "people who talk politics every day", and those with postgraduate degrees were "more likely than others to say that such murder is sometimes justifiable".{{Cite web |last=Survey |date=December 13, 2024 |title=Only 10% Consider Man Who Murdered United Healthcare CEO a Hero |url=https://napolitannews.org/posts/10-percent-consider-man-who-murdered-united-healthcare-ceo-a-hero |url-status=live |archive-url=https://web.archive.org/web/20241213201925/https://napolitannews.org/posts/10-percent-consider-man-who-murdered-united-healthcare-ceo-a-hero |archive-date=December 13, 2024 |access-date=December 14, 2024 |website=Napolitan News Service}}

The Center for Strategic Politics ran an online poll with 455 American adults on December 11. The poll found that "61% of respondents said they have a strong or somewhat negative perception of Mangione", while 19% had a positive or somewhat positive view. Opinions on Mangione varied "dramatically" by age.{{cite web |last1=Rascius |first1=Brendan |title=How do Americans feel about Luigi Mangione? Poll finds generational and gender divide |url=https://www.miamiherald.com/news/nation-world/national/article297069729.html |date=13 December 2024 |website=Miami Herald |access-date=15 December 2024}} The poll also found that young Americans view Mangione "far more favorably" than they viewed Thompson and UnitedHealthcare.{{cite web |last1=Del Rey |first1=Michelle |title=Poll: Young Americans favor Luigi Mangione over UnitedHealthcare CEO Brian Thompson |url=https://www.independent.co.uk/news/world/americas/crime/luigi-mangione-ceo-unitedhealthcare-lawyer-karen-agnifilo-latest-b2664635.html?page=5 |website=The Independent |access-date=16 December 2024 |date=14 December 2024 |archive-url=https://archive.today/20241216002244/https://www.independent.co.uk/news/world/americas/crime/luigi-mangione-ceo-unitedhealthcare-lawyer-karen-agnifilo-latest-b2664635.html?page=5 |archive-date=16 December 2024}}{{cite press release |first=Jordan |last=Buchman |title=In First Poll Released Since Killing, Young Americans Favor Luigi Mangione over UnitedHealthcare & Slain CEO Brian Thompson |url=https://stratpolitics.org/2024/12/unitedhealthcare-poll/ |website=Center for Strategic Politics |access-date=16 December 2024 |date=13 December 2024 |archive-date=December 14, 2024 |archive-url=https://web.archive.org/web/20241214192700/https://stratpolitics.org/2024/12/unitedhealthcare-poll/ |url-status=live }}

A poll of 6,000 U.S. adults was conducted by CloudResearch on December 19, utilizing AI. The poll found that 27% of respondents were sympathetic to Mangione, with 12% supporting the murder. Support for the murder was higher among those under 30 and the political left.{{cite web |last=Staahl |first=Derek |date=20 December 2024 |title=1 in 4 Americans sympathize with Luigi Mangione; AI poll reveals why |url=https://www.azfamily.com/2024/12/20/1-4-americans-sympathize-with-luigi-mangione-ai-poll-reveals-why/ |url-status=live |archive-url=https://web.archive.org/web/20241223202523/https://www.azfamily.com/2024/12/20/1-4-americans-sympathize-with-luigi-mangione-ai-poll-reveals-why/ |archive-date=December 23, 2024 |access-date=23 December 2024 |website=Arizona Family}}

Generation Lab conducted a poll of 1,026 U.S. college students between December 19 and 23. When asked about who they sympathized with more, 45% of respondents said the suspect, 17% said Thompson, and 37% said neither. Most respondents (81%) said they have an extremely or somewhat negative view of Thompson.{{cite web |last1=Pandey |first1=Erica |title=Exclusive: College students sympathize more with CEO shooting suspect than victim |url=https://www.axios.com/2025/01/09/luigi-mangione-approval-poll-gen-z |website=Axios |access-date=9 January 2025 |date=9 January 2025}}

USA Today/Suffolk University conducted a poll of over 1,000 registered voters between January 7 and 11. The poll found that almost two-thirds of respondents thought the killing was wrong and that the killer should be prosecuted. Most of the rest agreed that the killing was wrong, but that they understood the killer's anger.{{cite web |last1=Alltucker |first1=Ken |last2=Cuevas |first2=Eduardo |date=2025-01-16 |title=Throw the book at UnitedHealthcare CEO murderer, voters say in exclusive poll |url=https://www.usatoday.com/story/news/health/2025/01/16/unitedhealthcare-ceo-shooting-exclusive-poll/77719562007/ |access-date=18 January 2025 |website=USA Today}}

• Healthcare in the United States
• Healthcare reform debate in the United States

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{{efn|name=NYmurder|The state of New York defines first- and second-degree murder differently than most states. Usually premeditated murder is first-degree; in New York it is second-degree, with first-degree being reserved for a premeditated murder with one of a list of aggravating factors.{{Cite web |title=How New York prosecutors used a terrorism law in the charges against Luigi Mangione |url=https://apnews.com/article/unitedhealthcare-ceo-killing-luigi-mangione-terrorism-law-7fcb28dcc0106c980b6ecf4aa9cf682f |first=Jennifer |last=Peltz |date=December 19, 2024 |website=Associated Press |access-date=December 22, 2024 |archive-date=December 20, 2024 |archive-url=https://web.archive.org/web/20241220224719/https://apnews.com/article/unitedhealthcare-ceo-killing-luigi-mangione-terrorism-law-7fcb28dcc0106c980b6ecf4aa9cf682f |url-status=live }} The only possibly applicable one in this case is murder committed as an act of terrorism. See Murder in New York law.}}

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• {{wikinews inline|Suspect in shooting death of UnitedHealthcare CEO fled New York City by bus, police say}}

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