John Cooper convicted of his crimes.The evil serial killer’s first victims were brother and sister Helen and Richard Thomas, who were shot at their manor hour near Milford Haven in 1985 – before their home was set on fire.Four years later Cooper murdered husband and wife Peter and Gwenda Dixon on a coastal path in Pembrokeshire, on the last day of their holiday.The investigation into their deaths is dramatised in ITV's new true crime drama The Pembrokeshire Murders.
Detective Superintendent Steve Wilkins decided to reopen the murder investigation in 2006 – when forensic science was much more advanced than it was in the 1980s.The serious crime unit at the Dyfed-Powys police force were convinced Cooper, who was at the time serving a 14 year.
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