The assassination was suicide. JFK set up Oswald as a patsy and changed the motorcade route to go by the Book Depository building.
When the car clears the sign on the Zapruder film, JFK was just dropping the gun after it had accidentally discharged and hit Connely. He has his hands up and in front of his throat in a fumbling motion as if he is trying to catch the dropped gun.
When the gun lands, it hits the telephone box and discharges hitting Kennedy in the front right of his head.Kennedy was distraught because of his back pain and the medication he was taken. The mafia had threatened him, LBJ was threatening to mount a campaign over Viet Nam, and the Cubans were very angry over the Bay of Pigs.
JFK figured he could remove himself, take the easy way out, and if he could make it look like and assassination he would become a sympathetic figure forever.
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