Via CNN:

Deceased Boston Marathon bombing suspect Tamerlan Tsarnaev participated in a 2011 gruesome triple homicide outside Boston along with a Chechen killed early Wednesday during a confrontation with the FBI and Massachusetts State Police in Orlando, Florida, a federal law enforcement official told CNN.

Ibragim Todashev, who died during the interview with authorities, not only confessed to his direct role in slashing the throats of three people in Waltham, Massachusetts, but also fingered Tsarnaev in the deaths, the official said Wednesday.

Todashev was being questioned about the slayings and his acquaintance with Tsarnaev.

Todashev attacked an FBI agent, who shot him dead, a federal law enforcement official with direct knowledge of the case told CNN.

The unsolved triple murder received renewed interest after it was learned that Tsarnaev had been a good friend of one of the Waltham victims.

Todashev told investigators the men were killed during a drug ripoff because he and Tsarnaev were afraid they would be able to identify them and tell police what happened, according to a law enforcement source.

So far, no link has been found between Todashev and the Boston Marathon bombings. However, the FBI is looking into the many connections between Todashev and Tsarnaev, whose radicalization allegedly led to the Boston bombings.