Tags: Criminal.
William Joseph Quinn known as Liam Quinn (born 1949) is a former United States-born volunteer in the Provisional Irish Republican Army who shot dead Stephen Tibble an off-duty police officer in London on 26 February 1975.Tibble who was off duty at the time saw Quinn fleeing from the police after he been noticed acting suspiciously near a house in which Quinn and fellow members of the Balcombe Street gang were later found to have been preparing bombs.