Todashev, who was reportedly a friend of deceased bomber Tamerlan Tsarnaev, fought in July of 2012. He submitted Bradford May with a guillotine in the first round of their bout at Real Fighting Championships in Florida.
Khusen Taramov, a friend of Todashev's, said that Tsarnaev and Todashev trained together in Boston. Tsarnaev trained and competed as a boxer.
"He used to talk on the phone with him (Tsarnaev)," said Taramov. "They talked last time a month ago. After the bombing, I couldn't believe it."
Todashev was reportedly being questioned about a triple-murder in Massachusetts in September of 2011. The FBI said in a statement Todashev posed an imminent threat to the agent.