Good Afternoon Clo!
Prudence dictates that I don't post the autopsy pictures of Ibragim.
True, it does look as if somebody tried to blow the back, and top of his head off. Although there was not as much damage as you would expect.
Even assuming that Ibragim slit the throats of three of his friends, I still don't think FBI agents would execute him.
I assume he said the wrong thing.
Although shots to the back of the head at close range do infer a certain intimacy with your killer.