An examination of the crimes of John Cooper, a Pembrokeshire farm labourer who won a fortune in a Spot the Ball competition and took to a life of drink, gambling and violence to sustain his lifestyle. By the time he was apprehended in 2009, he had murdered at least four people and left a trail of rape and burglary behind him that saw him given a whole life order.

Carol Park's body was pulled from a lake more than 20 years after she vanished - and the key to solving the case lay in unique forensics.