Liam Quinn

{{Short description|American volunteer in the Provisional Irish Republican Army (born 1949)}}

{{Other people|William Quinn}}

{{Use dmy dates|date=April 2022}}

{{Infobox criminal

| name = William Joseph Quinn

| image =

| image_size =

| caption =

| birth_date = {{birth year and age|1949}}

| birth_place = San Francisco, California, United States

| death_date =

| death_place =

| alias = Liam Quinn

| allegiance = {{nowrap|Provisional Irish Republican Army}}

| conviction = Murder

| conviction_penalty = Life imprisonment (35-year tariff)

| conviction_status = Released

| occupation =

}}

William Joseph Quinn, known as Liam Quinn, (born 1949) is an American former volunteer in the Provisional Irish Republican Army who shot dead Stephen Tibble, an off-duty police officer, in London on 26 February 1975.[https://query.nytimes.com/gst/fullpage.html?res=9A0DE4DC1F3CF932A15753C1A960948260&n=Top%2fReference%2fTimes%20Topics%2fOrganizations%2fI%2fIrish%20Republican%20Army%20 New York Times- American Is Extradited To Britain in Killing][http://archives.tcm.ie/irishexaminer/1998/05/06/ihead.htm Balcombe Street gang moved to Portlaoise] {{webarchive|url=https://web.archive.org/web/20070929104342/http://archives.tcm.ie/irishexaminer/1998/05/06/ihead.htm |date=2007-09-29 }}

Tibble saw Quinn fleeing from the police after he had been noticed acting suspiciously near a house in which Quinn and members of the Balcombe Street Gang were later found to have been preparing bombs. The unarmed Tibble chased Quinn on his motorbike and, while attempting to stop him, was fatally shot twice in the chest.{{cite news|title=BBC News On This Day - 1975: PC murder linked to IRA bomb factory|url=http://news.bbc.co.uk/onthisday/hi/dates/stories/february/27/newsid_2515000/2515789.stm|date=1975-02-27|access-date=2010-01-05}}