Boston Marathon bomber took part in a triple murder prior to bombing

Boston bombing suspect Tamerlan Tsarnaev took part in a triple homicide outside Boston, prior to the bombing,a federal law enforcement official told CNN. The source said Chechen Ibragim Todashev also confessed his own role before being killed today in Orlando by the FBI. After confessing, Todashev attacked the FBI agent with a knife after his confession and was shot and killed by FBI agents