John Cooper, now 76, was finally convicted of the double murderers of siblings Richard and Helen Thomas, and Peter and Gwenda Dixon in Pembrokeshire, Wales in 2011.But it took more than 20 years before the killer was identified due to lack of evidence.The story of how police finally cracked the murders is being told in the ITV true crime drama The Pembrokeshire Murders.The cold case review that began in 2005 finally cracked the case thanks to the advances of forensic science.Cooper had a long history of robberies and violent assault – and even appeared on television before he was caught.The most vital clue to solving the double murders was John Cooper’s appearance on the game show Bullseye.Chillingly, Cooper told host Jim Bowen how he loved.
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