Killer John Cooper was caught by police after tiny clues were pieced together. The hunt has been relived in ITV's true crime drama The Pembrokeshire Murders.
Cooper committed his heinous crimes in the Welsh county in the late 1980s, but he remained a free man for years. On December 22, 1985, he murdered brother and sister Richard and Helen Thomas before burning down their farmhouse.
Four years later, he robbed Peter Dixon of £300 and shot him and his wife Gwenda in the face at point blank range. And his crimes didn't stop there, he went on to commit a string of other offences, including 30 robberies and violent assault.
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