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

Gloria Marmolejo's attempt to stop her son's illicit relationship ended in her murder by him.

In April 1997, 27-year-old Rachel McGrath is stabbed to death by an unknown attacker in a car park.

Richard Kuklinski claims to have murdered over 100 people for New York and New Jersey's crime families.

A master manipulator is accused of the murder of his wife, and is eventually caught out by a polygraph test - and his own fiancée.