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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Previous Episodes

Episode NameAirdateTrailer
7x05: Railway KillersMay 8, 2015
7x04: Tampa Bay SlayerMay 1, 2015
7x03: Trail of FearsMar 26, 2015
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