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

In 1987, American serial killer Daniel Siebert is given two death sentences for killing vulnerable people across America.

Dublin man Eric Locke refuses to accept it when Sonia Blount, a mother of one, ends their relationship.

Diane Downs was convicted of the May 1983 murder of her daughter and attempted murder of her other two children, yet she told police a stranger had attempted to carjack her and had shot the children.

Four vicious murders put Mark Hobson at the center of a nationwide manhunt. Criminologists and psychologists try to decode this enigma.