Fred Kaplan, a former believer in JFK conspiracy theories, debunks some of the most popular ones:
For many years, long after I’d rejected most of the conspiracy buffs’ claims, the “magic bullet”—as critics called it—remained the one piece of the Dealey Plaza puzzle that I couldn’t fit into the picture; it was the one dissonant chord that, in certain moods, made me think there might have been two gunmen after all.
Then, in November 2003, on the murder’s 40th anniversary, I watched an ABC News documentary called The Kennedy Assassination: Beyond Conspiracy. In one segment, the producers showed the actual car in which the president and the others had been riding that day. One feature of the car, which I’d never heard or read about before, made my jaw literally drop. The back seat, where JFK rode, was three inches higher than the front seat, where Connally rode. Once that adjustment was made, the line from Oswald’s rifle to Kennedy’s upper back to Connally’s ribcage and wrist appeared absolutely straight. There was no need for a magic bullet.