Actaully, there were five shots, three from the TSBD and two from in front of the limo.
I have Nellie Connally's book that she wrote based on her notes she made after the assassination.
I don't remember her discussing four shots. I'd love to see the reference.
Folks who were there said it was a shooting gallery--war zone.
I remember man in suit standing at parade rest on the trestle in Life Magazine supposedly after the shootings.
The African-American boys yelling at a cameraman from perhaps the School Book Depository, a floor below the cameraman, pointing at the grassy knoll, perhaps.
The lady the Friday before who ran up to JFK's limo, addressing the President with, "Oh, My God, I could have shot you!!?"
Been maybe five years since that interview with Mrs. Connolly, so imagine hidden in some archive at one of the DFW TV stations...