How can anyone say there was only one bullet? From the Zapruder film, you can plainly see at least two times Kennedy was shot, once in the throat, when Jackie leaned over to him, and then the one to his head when Jackie went to the back of the limo for whatever reason, either from fright or trying to get the secret service agent’s attention. I haven’t read his book or saw the TV movie, but I think in O’Reilly’s version of events, there was only one bullet.
Jackie went to the back of the limo to retrieve a piece of Kennedy’s brain.
I know it is not logical but in a situation like that illogical action often happens. She tried to pick it up and put it back into his head.
You are right. I saw one news story where they played a sound recording of the shooting, overlayed on top the Zapruder film. It destroyed the single official theory.