World's Most Evil Killers säsong 5

A profile of the double-murderer Stephen Farrow, whose history of violence culminated in the killing of 77-year-old retired teacher Betty Yates and 59-year-old Reverend John Suddards in two frenzied attacks in 2012.

A look at the life and crimes of the murderer Victor Farrant, an ex-convict who claimed the life of Glenda Hoskins not long after being released from prison for rape and drugging.

The shocking story of Kenneth Regan and William Horncy, two ex-convicts who murdered a millionaire and three generations of his family in a vicious, greed-fuelled attack in 2003.

In 1986, roofer Russell Bishop sexually assaulted and killed two nine-year-old girls, Nicola Fellows and Karen Hadaway, whose tragic deaths in Brighton became known as the 'Babes in the Wood Murders'.

On one terrifying day in July 2000, Philip Austin systematically murdered his wife, two children, and two pet dogs in their Standens Barn family home in Northampton before going on the run.

A look at the twisted killer who pretended to be an MI5 agent before torturing and murdering a man in his home, filming the whole ordeal and torching the flat to cover his tracks.

The horrifying story of Sabah Khan, who murdered her own sister in a brutal attack at their family home in Luton after developing a deadly obsession whilst having an affair with her brother-in-law.

Murderer and rapist Colin Pitchfork took the lives of two 15-year-old girls in Leicestershire and became the first person to be convicted of murder based on DNA profiling evidence.

The story of the double murderer Ali Qazimaj, who was found guilty of the brutal killing of retired couple Peter and Sylvia Stuart in Weybread after being extradited from Luxembourg.

A profile of Billy Dunlop, who murdered 22-year-old Julie Hogg in 1989 and made legal history when he became the first person convicted under revised UK double-jeopardy laws in 2006.