In this Feb. 17, 2010, photo, Tamerlan Tsarnaev, left, Smiles after acceping the trophy for winning the 2010 New England Golden Gloves Championship from Dr. Joseph Downes, right, in Lowell, Mass. Tsarnaev, 26, who had been known to the FBI as Suspect No. 1 in the Boston Marathon Explosions and was seen in surveillance footage in a black baseball cap, was killed overnight on Friday, April 19, 2013, officials said. (AP Photo/The Lowell Sun, Julia Malakie) MANDATORY CREDIT;
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The FBI asked suspected Boston Marathon bomber Tamerlan Tsarnaev to be an informant on the Chechen and Muslim community, defense attorneys for his brother, Dzhokhar Tsarnaev, have claimed in federal court documents.
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