Ibragim Todashev, a friend of deceased Marathon bombings suspect Tamerlan Tsarnaev, told investigators that Tsarnaev participated in a triple murder in Waltham in 2011, according to a filing by prosecutors in federal court.
Todashev was killed by an FBI agent who was interviewing him in May. His death remains under investigation. Tsarnaev was killed when he was shot by police and run over by his own brother in a confrontation in Watertown several days after the April 15 bombings.
After the bombings, investigators began taking a closer look at whether Tsarnaev, who knew the Waltham murder victims, was involved in that case.
Todashev’s statement that Tsarnaev was involved in the murders was previously reported. But the court filing was the first official confirmation.
“According to Todashev, Tamerlan Tsarnaev participated in the Waltham homicides,” prosecutors said in the filing, though they did not elaborate.
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