They also said cell phone records connected Tamerlan and Todashev . Dead Boston bombing suspect implicated in 2011 killings , official says . Another man , Ibragim Todashev , attacks FBI agent with a knife , is killed . Comment: Authorities told him not to take a pending flight to Chechnya .
Dead Boston bombing suspect implicated in 2011 killings , official says . Another man , Ibragim Todashev , attacks FBI agent with a knife , is killed . Comment: Authorities told him not to take a pending flight to Chechnya .