12. The Happy Face Killer Part Two

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A happy face is a joyful symbol -- unless it's on a letter from a killer.

11. The Happy Face Killer Part One

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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?

10. The Black Widow: Part Two

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

9. The Black Widow: Part One

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

8. The Times Square Killer Pt Two

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

7. The Times Square Killer Pt One

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

6. The Twin: Part Two

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Identical Twins aren't always alike, especially when one might be a killer.

5. The Twin: Part One

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Identical Twins aren't always alike, especially when one might be a killer.

4. The Slave Master: Part Two

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Police must outwit a sly serial killer who calls himself "Slave Master."

3. The Slave Master: Part One

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Police must outwit a sly serial killer who calls himself "Slave Master."

2. The Trailside Killer: Part Two

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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.

1. The Trailside Killer: Part One

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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.

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