David Michael Krueger (March 5, 1939 – March 5, 2010), best known by his birth name, Peter Woodcock, was a Canadian serial killer and child rapist who gained notoriety for the brutal murders of three young children in Toronto, Canada, in 1956 and 1957 when he himself was still a teenager. He was placed in a psychiatric facility and subsequently diagnosed as a psychopath. Expensive treatment programs for Woodcock proved ineffective when he murdered a fellow psychiatric patient in 1991; after his death in 2010, he was dubbed by the Toronto Star as "The serial killer they couldn't cure".