Ibragim Todashev, a friend of deceased Boston Marathon bombings suspect Tamerlan Tsarnaev, told police that Tsarnaev participated in a triple murder in 2011.
Todashev was killed by an FBI agent who was interviewing him in May. His death is under investigation. Tsarnaev was killed days after the April 15 bombings.
After the attack, police began taking a closer look at whether Tamerlan Tsarnaev, who knew the Waltham, Mass., murder victims, was involved in that case.
Todashev’s statement that Tamerlan Tsarnaev was involved in the murders was previously reported. But a court filing this week was the first confirmation.
“According to Todashev, Tamerlan Tsarnaev participated in the Waltham homicides,” prosecutors said in the filing, though officials did not elaborate.