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Strange twist in Boston Marathon bombing investigation


The Boston Marathon bombing investigation has led authorities to Florida, where FBI agents questioned a man who had ties to bombing suspect Tamerlan Tsarnaev.  In a bizarre twist, law enforcement officials tell NBC News that Ibragim Todashev had confessed to taking part in an unsolved triple murder in Massachusetts, also implicating Tsarnaev in the homicides. Chris Hayes talks with NBC News National Investigative Correspondent Michael Isikoff about the latest details.