CNN Anderson Cooper 360 February 14, 2014 01:31:00
Single person responsible for committing this crime in custody. >> reporter: many people move here to rural tennessee to live quiet, peaceful lives. so news of the bombing was particularly stunning. friends and neighbors were horrified and puzzled, especially when it was described by authorities as a targeted killing. >> as a couple they were one of the best and the sweetest couples you'd ever meet. >> the last people in the world that you would imagine to be a target of a package bomb like that. >> reporter: investigators said they recovered a note they believe may have been attached to the p...