I looks like no one wants to cough up the $3-$4 to watch JFK - The Smoking Gun so I am going to ruin it for you. What this documentary is about is how the third shot did not come from the TSBD or the grassy knoll but from an AR15 in the car behind the president’s limo. A secret service agent had picked up the gun, stood up on the back seat, the car accelerated (or decelerated), he lost his balance and he accidentally squeezed off a round and that round hit JFK in the back of the head. Now you can understand why the cover up.
A gun expert Howard Donohue, and the only person that could get off 3 rounds in the 6.2 seconds from the carcano rifle, researched and found out several interesting things. First; the hole in the back of Kennedy’s measured 6mm in diameter, an AR15 (M16) round is 5.56 mm. The Carcano is a .308 which is 7.62 mm. A bullet hole in the head will be slightly larger than the actual bullet. Second, many people smelled gun smoke in the motorcade, half of them being SS agents. Third, Donohue lined up the head, the entrance hole in the back with the right temple “explosion” and it lines up perfectly with the shot coming from jfk’s left rear at a low angle. Forth, Agents in and around the following car remember seeing an agent with an AR15 in his hand and another agent thinks that he had fired the gun.
The documentary is based on this information from the book called Mortal Error by Bonar Menninger. The book is about Donohue’s findings.