This series takes an in-depth look at some of the world's most prolific serial killers and interviews those who were closest to them before learning about their secret, dark lives.

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Released: August 20, 2010
Runtime: 60 min
Countries: United States
Companies: Investigation Discovery

Episodes

► Season 1 - Click for episodes

► Season 2 - Click for episodes

► Season 3 - Click for episodes

► Season 4 - Click for episodes

► Season 5 - Click for episodes

► Season 6 - Click for episodes

► Season 7 - Click for episodes

► Season 8 - Click for episodes

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