Tamerlan Tsarnaev 's friend and sparring partner was killed in 2011 . The FBI is investigating the death of a man who had been friends with Dzhokhar Tsarnaev, according to law enforcement sources familiar with the investigation. The Middlesex County district attorney 's office said at the time that the three victims were killed by `` sharp force injuries of the neck . '' Source : The crime is being reviewed by `` wider group of eyes ''
Tamerlan Tsarnaev 's friend and sparring partner was killed in 2011 . The FBI is investigating the death of a man who had been friends with Dzhokhar Tsarnaev, according to law enforcement sources familiar with the investigation. Source : The crime is being reviewed by `` wider group of eyes ''