'Good old Johnny': The psychopath serial killer who appeared on a hit TV game show 8 Jan, 2021 09:11 PM 8 minutes to read Killer John William Cooper on the popular British game show Bullseye. Video / ITV Daily Telegraph UK It's one of the most bizarre moments in British criminal history. One month before carrying out a horrific double murder in a South Wales beauty spot, psychopathic serial killer John Cooper recorded an appearance on one of the most popular shows on British television – Bullseye, a Sunday evening game show that attracted up to 20 million viewers in its 1980s heyday. The show, hosted by club comedian Jim Bowen, featured contestants trying to win big prizes – speedboats, cars, holidays – with their skill at darts.