Now, I'll have to kill you after I tell you this, so you may not want to read it.
Good ole Teddy was feeling his gin and oats, and the Kennedy boys never took NO for an answer. They were used to taking the pick of the litter, and those picked were usually thrilled.
Teddy found a stray sheep in Mary Jo. She was a GOOD GIRL, and nothing pleases wolves more than plundering a sheep with virgin wool.
Mary Jo had been stalled just long enough to miss the ferry back to the mainland. Good OLE Teddy offered her a ride. He told her he could get her to the ferry on time.
His being one of the big K's and being older, she trusted him.
He headed out with her in his car, then he turned off onto a bumpy road that led to a deserted beach area.
Mary Jo complained about not going to catch the ferry, and Teddy told her this was a shortcut.
When they got to the beach, Teddy told her they missed the ferry, so they might as well get out and relax on the beach, maybe take a swim.
She didn't want to, and Teddy kept pushing. He started man-handling her, in a drunk attempt at petting and fondling.
She kept fighting, and he started telling her how rich and important he was, and that she should be dying to make out with him.
She started slapping out at him, and he lost his temper. He choked her to death.
He drove back along the side road, parked the car somewhere off the main road, and walked back to the hotel to get help.
He got in touch with a his lawyer and 'the cleanup man'. The cleanup man went back, got the car, and decided to run it off the bridge, and make the death appear to be an accident.
The rest of the story you know.
I tend to agree with you and I think your version of the story is closer to the truth then the story we know.