Levi King kills two Missouri residents in 2005, then travels to the Texas Panhandle to continue his murderous ways.
Maksim Gelman embarks upon a 28-hour killing spree through New York City in February 2011, leaving four people dead and others injured.
A "push-button killer" who served time for stabbing a woman unleashes his hidden rage on a new girlfriend.
A woman and her boyfriend, a convicted rapist, unleash their violent sexual fantasies upon two innocent victims.
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.
