Oswald killed Kennedy all by himself. There was no second gunman, and nobody on the “grassy knoll.” Oswald was a penniless loser with a grudge; if he’d really been in the pay of the Mafia or the CIA or even Lyndon Johnson, someone would have ponied up the $50-60 to buy him a nice shiny Winchester Model 70. He used a $13 Carcano because that’s all he could afford. As to the “magic bullet” anyone familiar with the performance of the various 6.5 rounds knows full well that they’re noted for phenomenal penetration. Oswald acted alone; period, end of discussion. See Gerald Posner’s book, Case Closed.