The late Tamerlan Tsarnaev, suspected in the Boston Marathon bombing, is believed to have committed a grisly triple murder in 2011, law enforcement officials said after a man believed to be his accomplice was gunned down in Orlando yesterday by a federal agent who was questioning him, the Wall Street Journal reports. Ibragim Todashev, 27, was shot dead after he lunged at and cut an FBI agent, who with two Massachusetts state troopers had been questioning him about the murders in Waltham, Ma. Officials said Todashev made a series of incriminating statements about the murders, implicating himself and Tsarnaev. Todashev and Tamerlan Tsarnaev belonged to a small circle: ethnic Chechens on the Boston-area fighting circuit. One of the Waltham victims was also involved in amateur fighting and sometimes sparred with Tamerlan.