Aino Nykopp-Koski
{{short description|Finnish nurse convicted of killing patients}}
{{Infobox serial killer
| name = Aino Nykopp-Koski
| image =
| caption =
| alt =
| birthname = Aino Kerttu Annikki Nykopp
| alias =
| birth_date = November 1950{{cite news | author=Ranta, Niko | title=Myrkkyhoitaja haluaa vapauteen | newspaper=Ilta-Sanomat | date=7 February 2020 | page=9 | language=Finnish | url=http://www.is.fi/kotimaa/art-2000006398490.html }}
| birth_place =
| death_date =
| death_place =
| cause =
| conviction = 5 murders,
5 attempted murders,
3 aggravated assaults,
4 thefts,
2 drug possessions
| sentence = Lifetime
| victims =5
| beginyear =2004
| endyear =2009
| country =Finland
| states =
| apprehended = March 2009
}}
Aino Nykopp-Koski (born November 1950) is a Finnish serial killer. She worked as a nurse and was found guilty of killing five patients and the attempted murder of five more. No motive was established for the murders.[https://www.telegraph.co.uk/news/worldnews/europe/finland/8220323/Finnish-nurse-gets-life-for-murdering-five-patients.html Finnish nurse gets life for murdering five patients], Telegraph
Crimes
Between 2004 and 2009 Nykopp-Koski worked at a range of hospitals, care homes and patients' homes. There she killed five elderly patients using sedatives and opiates. She was apprehended in March 2009.
Nykopp-Koski was tried in Helsinki District Court in December 2010 and pleaded not guilty, though the court convicted her. She was sentenced to life in prison (minimum of 12 years before likely pardon). During the mental health assessment, psychiatrists found out that Nykopp-Koski is psychopathic and has an antisocial personality disorder, but she was deemed culpable for her actions. The sentence was upheld by Helsinki Court of Appeals in March 2012.[http://yle.fi/uutiset/news/2012/03/killer_nurses_life_sentence_upheld_3369709.html Killer nurse's life sentence upheld], YLE News Supreme Court of Finland dismissed her leave to appeal in November 2012.[http://www.helsinkitimes.fi/index.php/finland/finland-news/domestic/4533-supreme-court-upholds-sentence-in-poison-nurse-case Supreme Court upholds sentence in poison nurse case.] Helsinki Times.
After her conviction, Nykopp-Koski changed her name to Ann-Maria Myllgren.
In May 2020, the Helsinki Court of Appeals rejected Myllgren's parole application. Myllgren had requested to be paroled in March 2021, when she would have served the legal minimum of 12 years.{{Cite web |title=Hovioikeus hylkäsi vanhuksia murhanneen hoitajan vaatimuksen päästä ehdonalaiseen vapauteen |url=https://www.hs.fi/kotimaa/art-2000006508828.html |date=2020-05-15 |website=Helsingin Sanomat |language=fi |access-date=2020-05-15}}