Britain's Most Evil Killers

A case highlighting the dangers of online grooming, 14-year-old Breck Bednar was lured to a flat before being killed by a fellow teenager. (S7, ep 1)

The 'housemate from hell', Ben Field plotted the death of his two elderly landlords in a bid to inherit from their estates. (S7, ep 2)

A family's worst nightmare occurs when 16-year-old Becky Watts goes missing, and is found dead days later, murdered by her own stepbrother. (S7, ep 3)

A dangerous sexual predator, John Cannan murdered one young woman just days after his release from prison, and is suspected of many others. (S7, ep 4)

A fugitive from the United States murders one British police officer and tries to kill two more, sparking a nationwide search. (S7, ep 5)

Jailed for the dreadful murder of a children's author, Ian Stewart receives a second conviction for the death of his wife, six years earlier. (S7, ep 6)

On the surface, Zahid Zaman portrayed himself as a pillar of the community, but the true story of this cult killer was deeply sinister. (S7, ep 7)

After striking up a friendship in prison for previous murders, Stephen Unwin and William McFall's release had awful consequences. (S7, ep 8)

Thirty-two years later, a convicted killer serving life for manslaughter is found to be guilty of having committed a second murder. (S7, ep 9)

A master manipulator is accused of the murder of his wife, and is eventually caught out by a polygraph test - and his own fiancee. (S7, ep 10)