A Florida state attorney has cleared an FBI agent and a Massachusetts State Police officer in last May's shooting death of a Chechen man who was friends with the Boston Marathon bombers.

Ibragim Todashev had been cooperative during hours of questioning in his Orlando apartment, State Attorney Jeffrey Ashton wrote Tuesday in a letter to FBI Director James Comey. But his mood changed after he "confessed to some involvement" in a 2011 triple homicide in Massachusetts also under investigation, and after he realized he might be arrested.

Todashev, described as a "skilled mixed-martial arts fighter," heaved a coffee table at the FBI agent, hitting him in the head. He ran into his kitchen, coming out holding a five-foot-long metal pole over his head "with the end of the pole pointed toward [the FBI agent] as if intended to be used to impale rather than strike," Ashton wrote. The agent fired three shots, which knocked Todashev down. But he tried to get back to his feet, prompting the agent to fire three or four more shots, killing Todashev.

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