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Investigation Discovery continues its heritage of providing in-depth  compelling documentaries & shows.

Investigation Discovery

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

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

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.

The Twin

Host Donnie Wahlberg sheds light on Larry Hall, a serial killer who murdered young women across the American heartland during the 1990s, and his relationship with his identical twin brother.

The host sheds light on the sly serial killer who calls himself "The Slave Master" 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.

S5 E4 | The Slave Master