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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.
The inexplicable weirdness of Rick Scott04:31
Bad news for some blue state GOP governors05:30
Leaks from the Mike Brown investigation surface07:27
Amazing video of Ottawa post office evacuation01:35
Who was the Ottawa gunman?07:38
Shooting attack in Ottawa stuns Canada16:11