Mary Jo was in the back seat and, while he claimed he was just giving her a lift back to her hotel, it was widely thought that he had picked her up for sex. Kennedy swam ashore to save himself, but left Mary Jo to drown - in fact, it was even worse than that. It was nine hours before he reported the accident. In the meantime, he walked back to his motel, complained to the manager about a noisy party, took a shower, went to sleep, ordered newspapers when he woke up and spoke to a friend and two lawyers before finally calling the police. Divers later estimated that if he had called them immediately, they would have had time to pull out Mary Jo. She had not drowned, but had survived.
I read somewhere else - I can't find the article again - that MJ Kopechne survived for 3 hours on the oxygen left in the car and her head was tilted toward the air pocket when they took her body out. She lived and waited for him to come back for her in total darkness. UNREAL!
No wonder he didn't want an autopsy. Maybe they were capable of killing Marilyn Monroe.