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.
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Todashev was being interviewed in the kitchen of his Florida home. He grabbed a knife, which is why fatal force was used, according to a source briefed on the ongoing investigation.
"Preliminary information indicates the agent took actions to defend himself," said a federal law enforcement official with direct knowledge of the case.
"The agent sustained non-life-threatening injuries," FBI spokesman Jason Pack said.