Tamerlan Tsarnaev

In this February 2010, file photo, Tamerlan Tsarnaev smiles after accepting the trophy for winning a New England boxing championship. Prosecutors in the case against Boston Marathon bombing suspect Dzhokhar Tsarnaev, Tamerlan's brother, say a man shot to death during questioning by an agent in Florida told investigators Tamerlan had been involved in a triple homicide.

Julia Malakie / Associated Press
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