John Cooper is one of Wales' most notorious serial killers, but it took over two decades to bring him to justice. The 76-year-old Welsh killer is currently behind bars in an undisclosed prison.Luke Evans plays detective Steve Wilkins in the new ITV drama The Pembrokeshire Murders, based on the chilling true story of the serial killer's four double murders.The killer was given four life sentences for a series of horrific murders that occurred in Pembrokeshire in the 1980s, following a cold-case review that began in 2005.How did he manage to evade justice for over 20 years after the killings?Cooper had a long history of crime, including 30 robberies and violent assault.
