The Killer Speaks (2013 - 2014)

Maksim Gelman discusses the four murders he committed in New York City in 2011.

A "push-button killer" who served time for stabbing a woman unleashes his hidden rage on a new girlfriend.

A Missouri man kills two people at a friend's home, then continues the bloodshed when authorities come looking for him.

Detectives in Great Falls, Mont., investigate the grisly stabbing death of a former corrections officer; the killer reveals his thoughts behind the crime.