Clo:
The Florida guy was a participant in a multiple murder in Waltham, Ma. unconnected to the Marathon bombing. He did know the Marathon bombers, and was in contact with one or the other.
I have no notion why the FBI would shoot him except in self-defense in the presence of two Ma. state police officers. The Chechens were out of control, and practiced in martial arts. I have no idea why they were allowed to immigrate to our country. Time to revamp immigration rules.