1. Stephen Unwin & William Mcfall

44m

Deadly consequences come from a friendship between two murderers who met in prison.

2. John Cannan

44m

A dangerous sexual predator murdered one young woman just days after his release from prison.

3. Lewis Daynes

44m

The horrifying story of a computer engineer who lured a 14-year-old school boy to his flat and killed him.

4. Colin Campbell

45m

A convicted killer serving life for manslaughter is found to be guilty of a second murder 32 years later.

5. Ben Field

44m

A young criminal plots the deaths of his two elderly landlords in a bid to inherit from their estates.

6. Nathan Matthews

44m

16-year-old Becky Watts goes missing and is found dead a few days later, murdered by her own step-brother.

7. David Bieber

44m

A fugitive from the United States tackles the British police and goes on the run.

8. Adrian Prout

44m

A master manipulator accused of his wife's murder is eventually caught by a polygraph test.

9. Ian Stewart

44m

A jailing for the shocking murder of author Helen Bailey leads to a second conviction of another.

10. Zahid Zaman

43m

A cult killer portrayed himself as a pillar of the community, but his story was deeply sinister.

World's Most Evil Killers - Season 7

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