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How serial killer John Cooper’s wife unknowingly gave key evidence that helped catch him
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.