Investigation Discovery continues its heritage of providing in-depth, compelling documentaries & series that challenge viewers to think about key issues that shape our culture and define our world.

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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

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

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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