[woodbutcher1963]

That is another theory that has been brought forth over the last ten years. I believe in a book. That the hung over SS agent in the back seat of the car following the limo shot him by mistake in the back of the head. This is after Oswald's first shot hit the pavement to the side of the limo. A piece of asphalt hit a person on the overpass. The second of Oswald's shots was the one that hit Kennedy in the back and came out his neck and then hit Connolly(the magic bullet). The third shot came from the SS agent behind when their car stopped short and the rifle went off by accident.
Thus, why the SS took control of the operating room and covered up the error.

There was also an Australian group that reenacted the entire shooting using forensic evidence. They came to the same conclusion that the shot that killed him came from directly behind the limo. Not in front from the grassy knoll. Also, that the hole in the back of Kennedy's head was the same diameter as the round fired by the weapon used by the SS agents. That the round fired by Oswald's weapon was larger than the hole in the back of his head.

[coalminersson]

That is another theory that has been brought forth over the last ten years. I believe in a book. That the hung over SS agent in the back seat of the car following the limo shot him by mistake in the back of the head. IIRC “as the car accelerated it threw him back and his weapon went off.” This after the first shot.