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John William Cooper (born 3 September 1944) is a Welsh serial killer and diagnosed psychopath. On 26 May 2011, Cooper was given a whole life order for the 1985 double murder of siblings Richard and Helen Thomas, and the 1989 double murder of Peter and Gwenda Dixon. Cooper was also sentenced for the rape of a 16-year-old girl and a sexual assault on a 15-year-old girl, both carried out at gunpoint, in March 1996, in woodland behind the Mount Estate, Milford Haven, Pembrokeshire.