In this special episode, we focus on those criminals who have been brought to justice for one crime only to be released to commit further terrible acts.
Keith Henry Blakelock who was a London Metropolitan Police constable, was murdered on 6 October 1985 in the Broadwater Farm riot that was triggered by the death of a black woman the day before.
Peter Tobin is one of the most notorious serial killers in the UK. From 1991 - 2006 he kidnapped and murdered three young girls: Dinah McNicol, Vicky Hamilton, and Angelika Kluk. Investigators believe he is responsible for more.
Double murderer, John Sweeney, brutally murdered two of his girlfriends, dismembered their bodies and dumped them in canals. Handed two life sentences he was told he will die in prison.
