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

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

Steven Dean Gordon and Frank Cano murdered at least four sex workers in California between 2012 and 2013.

In 1999 and 2000, John Eric Armstrong cruises the streets of Detroit looking for sex workers.

In 2007, single mother of three Paige Birgfeld goes missing.