text: In this Feb. 17, 2010, file photo, Tamerlan Tsarnaev smiles after accepting the trophy for winning the 2010 New England Golden Gloves Championship in Lowell, Mass. 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 that Tamerlan had been involved in a triple homicide.