The Pembrokeshire Murders: How brutal Welsh shotgun killer John Cooper was caught thanks to a pair of shorts and the TV game show Bullseye John Cooper committed a pair of hideous double murders that sent shockwaves across the nation, now the story has been turned into a true crime drama by ITV Updated Sign up to FREE email alerts from Wales Online - Subscribe When you subscribe we will use the information you provide to send you these newsletters. Your information will be used in accordance with ourPrivacy Notice. Thank you for subscribingWe have more newslettersShow meSee ourprivacy notice Two days before Christmas in 1985 the charred remains of a body were recovered from the smouldering rubble of a three-storey manor house near Milford Haven.