
An in-depth look at some of the world's most dangerous murderers.

The story of the Beltway sniper attacks; John Allen and his teenage accomplice carry out a brutal series of shootings that kill ten people.

Malcolm Green is jailed for life for the brutal murder of a Cardiff prostitute; he kills again when he is released after 18 years.

The story of Mark Martin, who murdered three homeless women in his quest to become Nottingham's first serial killer.

Geoffrey Evans and his accomplice John Shaw hit headlines in 1976 after the murders of two women in Ireland.