Yeah, I saw that one program about the theory that the one SS agent accidentally shot JFK when grabbing his rifle to fire back at the 6th floor window. Whoever was up there fired the first two shots, the second hitting Kennedy in the neck and then hitting Connolly (the "magic bullet" theory). The shot to Kennedy's head was the friendly fire from the SS agent rifle.
IDK, think that one has much credibility? People don't talk about it much. Most are either lone gunman or grassy knoll theorists.