The most terrifying serial killer you've ever heard of



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In 2012, police arrested a man named Israel Keyes in connection with the death of a barista in Alaska. But it was not an isolated incident in Keyes' life; It turns out he was a serial killer who could be responsible for at least 10 additional deaths. Maureen Callahan, author of "American Predator: In Search of the Most Meticular Serial Killer of the 21st Century", estimates that the number could be much higher. "He killed all the United States," she told InsideEdition.com.

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