In May 2013 , Ibragim Todashev , a 27-year-old Chechen native and former mixed martial arts fighter who knew Coming_to_believe Tamerlan Tsarnaev , was shot Bodily_harm and killed Killing in Orlando , Florida , by law enforcement officers who had been interviewing Communication him about the Waltham murders Killing as well as the Boston Marathon bombings Terrorism .

The Civil Aeronautics Board ( CAB ) investigated Criminal_investigation the accident Catastrophe and , after interviewing Communication numerous eyewitnesses and examining Testing the debris field , were able to conclude Coming_to_believe that the initial failure of the aircraft had begun Process_start in the left Departing wing .