Joe Dziemianowicz

Before Oxygen’s “Snapped Notorious: The Happy Face Killer," premieres, learn about the case and the loosely related Smiley Face Killer.

Could a serial killer terrorizing a southern community turn out to be one of its most well-liked members?

Investigators had a suspect in mind when Ursula Duran was murdered, and were shocked when the real killer's identity was unmasked.

A 15-year-old kidnap survivor's escape led police to a serial killer: Richard Evonitz. 

In a prison interview with "Snapped: Behind Bars," convicted mother-in-law murderer Misook Wang denies killing her ex-lover’s little girl.

In the late 1970s in California, a pair of notorious serial killers, Lawrence Bittaker and Roy Norris, preyed on young women and documented the attacks.

Misook Wang has been in prison for eight years for murder. In "Snapped: Behind Bars," she'll speak out about killing her mother-in-law. 

A cash-strapped restaurant owner, Guy Sileo, cooked up a deadly plan to pay off his debts.

Steve Riggins' affair with his teen babysitter was the key to catching him as his wife’s killer.

What detectives found inside an Idaho home was “straight out of some horror movie.” But was it murder?