The Pembrokeshire Murders: Catching The Game Show Killer delved into the disturbing story of how serial killer John Cooper was finally convicted.
John Cooper, known as the Bullseye Killer as he once appeared on the gameshow, is now serving four life sentences for the murder Peter and Gwenda Dixon and Richard and Helen Thomas.
He was also sentenced for a vicious gunpoint rape and sexual assault on a group of teens.
The hour-long documentary featured the detectives, lawyers and forensic scientist who worked in the terrifying case.
It also included jaw-dropping footage and news reports from the case, including Cooper's interviews and arrest.
Gerard Elias QC was the prosecuting barrister at the 2011 trial at Swansea Crown Court.
In the chilling documentary, he said Cooper was a level of evil he'd never seen before.
He explained: "[There was a] cold controlled evil that I saw in Cooper that I don't think I've seen in anyone else I've been involved with.
"I've certainly never been involved in a trial before where there were three separate but complex and hugely important matters. And, of course, the evidence of one supported the evidence of another."
John evaded justice for over a quarter of a century, as forensic evidence needed to convict him remained undiscovered for decades.
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