The murder of Taunja Bennett is the first of many bodies found in the Pacific Northwest, California, and beyond. Police never link the deaths until someone starts sending macabre letters signed with a happy face. Is this the end -- or just the beginning?

The murder of Taunja Bennett is the first of many bodies found in the Pacific Northwest, California, and beyond. Police never link the deaths until someone starts sending macabre letters signed with a happy face. Is this the end -- or just the beginning?

Nurse Judy Buenoano survives a string of unimaginable tragedies, including two house fires, a mysterious canoe accident and the loss of her husband, boyfriend, and child. Is Judy just a magnet for bad luck, or is something far more sinister at play?

Nurse Judy Buenoano survives a string of unimaginable tragedies, including two house fires, a mysterious canoe accident and the loss of her husband, boyfriend, and child. Is Judy just a magnet for bad luck, or is something far more sinister at play?

New York City firefighters discover the headless bodies of two sex workers, leading the tabloids to dub the perpetrator the "Times Square Killer." Now, investigators must find a way to hunt down a psychopath adept at blending into his surroundings.

New York City firefighters discover the headless bodies of two sex workers, leading the tabloids to dub the perpetrator the "Times Square Killer." Now, investigators must find a way to hunt down a psychopath adept at blending into his surroundings.

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

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

In the mid-'80s, Kansas City women start to vanish. They all share one thing in common -- an odd connection to the same cunning man who calls himself "The Slave Master." Police must be just as wily if they want to bring down this serial killing sadist.

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.

It's the late 70s, and a baffling mystery plagues Northern California's popular hiking trails -- a serial rapist and murderer dubbed the "Trailside Killer" terrorizes the area. Investigators find few clues -- until one brave victim manages to get away.

From 1979-1981, the popular hiking trails of Northern California became the setting of a terrifying mystery. A man known as the Trailside Killer was raping and killing women in a place they had always felt safe. The cold-blooded attacks stunned the community and frustrated law enforcement. They had few clues as to the killer's identity, until one victim managed to get away and identified a middle-aged man living an ordinary life with his parents.