John Cooper is one of the most notorious criminals in British history.
He burgled, raped and murdered during a 15-year reign of terror, which included four executions by shotgun. And, far from keeping a low profile between crimes, he even took time to appear on the gameshow Bullseye.
This year, he was jailed for life. ITV Wales had exclusive access to the police enquiry and forensic science which finally trapped Cooper.
An hour-long programme The Bullseye Killer was transmitted the night Cooper was jailed in May. But it’s still on-line. Follow this link to watch it now.