According to federal law enforcement officials, the man was being interviewed about whether he and Tamerlan Tsarnaev, the bombing suspect, were connected to a two-year-old triple slaying when he attacked an FBI agent. There were conflicting accounts of what happened in the moments before the man was shot.
One federal law enforcement official said the man, a professional martial-arts fighter, was shot after trying to grab the FBI agent’s gun. Two other officials said the man reached for a knife and was shot as he attacked the agent. All three officials spoke on the condition of anonymity because the episode is under official review.[…]The FBI provided few details about the shooting in Orlando and did not mention the Waltham slayings, but the bizarre twist demonstrated the extent of the ongoing investigation into the April 15 Boston Marathon bombing, which killed three people and injured more than 260.