William MacDonald (born Allan Ginsberg; 17 June 1924 – 12 May 2015), also known as The Mutilator, was an Australian serial killer. He murdered five men, four in Sydney, New South Wales and one in Brisbane, Queensland, between 1961 and 1962. After his murders, he lived in New Zealand for a short time. After moving back to Australia, he ran off to Melbourne, Victoria where he was arrested.