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A happy face is supposed to be a joyful symbol, unless it's on a letter from a killer.

Very Scary People

The Happy Face Killer

Host Donnie Wahlberg delves into the notorious crimes of Keith Hunter Jesperson, a serial killer in the 1990s, who drew smiley faces on his confession letters to local authorities.

The cops wonder if a series of deaths means a black widow is spinning her web.

The Black Widow

The only thing scarier than a serial killer is one hiding in plain sight.

The Times Square Killer

Someone snatches a student from her college campus in Indiana, while a second missing girl turns up dead months later; terrified girls report a man trying to lure them into his van; police wonder if he is the real killer until one man confesses.

The Twin

Host Donnie Wahlberg sheds light on serial killer Larry Hall, from his relationship with his identical twin brother to his murderous rampage against young women across the American heartland in the 1990s.

The host sheds light on the American serial killer who calls himself "The Slavemaster" and reveals the twisted methodology behind his heinous crimes.

The Slave Master

In the mid 1980s, Kansas City women start to vanish; they all share one thing in common, an odd connection to the same man who calls himself "The Slave Master"; police must be just as wily if they want to bring down this serial killing sadist.

A killer stalks California; the clues are scarce, until one victim gets away.

The Trailside Killer

Host Donnie Wahlberg chronicles the twisted lives of diabolical criminals, such as Charles Manson, Aileen Wuornos, John Wayne Gacy, the Rev. Jim Jones, and others.

S5 E8 | The Times Square Killer

E12 | The Happy Face Killer

E11 | The Happy Face Killer

E10 | The Black Widow

E9 | The Black Widow

E8 | The Times Square Killer

E7 | The Times Square Killer

E6 | The Twin

E5 | The Twin

E4 | The Slave Master

E3 | The Slave Master

E2 | The Trailside Killer

E1 | The Trailside Killer