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Mark of a Serial Killer
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Witness Claims She Saw ���Grim Sleeper��� Serial Killer

CLIP10/20/21
Also available on the nbc app

A woman came forward to say she saw the killer shoot a victim and cover her up with a mattress. She had a name, too. Was she on the right track?

Appearing:
Tags: Mark of a Serial Killer, True Crime, oxygen, serial killers
S3 E71 minTV-14HighlightReality and Game ShowPrimetime
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