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Erin Moriarty speaks on twin murder case: "I have never run into anything like this"

A Texas teenager has been charged in the deadly stabbing of his own twin sister. On the season premiere of "48 Hours," at his trial, attorneys for 17-year-old Benjamin Elliott said he was sleepwalking when he killed her. CBS News "48 Hours" correspondent Erin Moriarty discusses the case.
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