Man Killed by FBI in Custody Reportedly Confessed to Role in Triple Homicide in Mass.

Knew the Tsarnaevs, but not a suspect in the marathon bombings

An FBI agent shot and killed an Orlando man and former mixed-martial arts fighter believed to be tied to Tamerlan Tsarnaev, the deceased Boston Marathon bombing suspect.

Early this morning, during a post-midnight interview with Ibragim Todashev at his apartment, an FBI agent shot Todashev. An interview with Todashev about his connections to Tsarnaev began peacefully, with Todashev reportedly cooperating, before taking a fatal turn for unclear reasons.

"There was some sort of aggressive movement that led the FBI agent to believe he was under threat and he opened fire," an anonymous law-enforcement official told ABC News.

An initial inquiry to the FBI about what happened in Orlando last night has yet to be answered; this post will be updated when more information is available.