Tamerlan Tsarnaev involved in triple homicide, sources say
01:13
The FBI’s meeting with one of Tsarnaev’s friends in Florida turned violent Wednesday when he lunged at an FBI agent with a knife and was shot and killed. Before the shooting, he admitted to playing a role in a triple murder in Waltham, Mass., in 2011, along with Tsarnaev. NBC’s Pete Williams reports.May 22, 2013
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