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Tracy Ullman talks ‘The Serial Killer’s Apprentice’

True crime writer and producer Tracy Ullman joins Karen Conti to discuss the newly released HBO documentary, ‘The Serial ...

Watch ‘The Serial Killer’s Apprentice’ episode 2 free today: Streaming options

The "Serial Killer's Apprentice" episode 2 airs tonight on Investigation Discovery. Find out how to watch for free as ...