Mary Joe Kopechne died of lack of oxygen--not drowning.
Ted waited until thhe next morning to report it to the police.
The coroner's report is on the internet.
She was found the next day in a rigor mortis position in the upside down car with her arms locked to hold her up and her neck twisted as far back and upward as possible to keep her head in the air pocket at the top of the car.
Gene Frieh, the undertaker, told reporters that death "was due to suffocation rather than drowning". John Farrar, the diver who removed Kopechne from the car, claimed she was "too buoyant to be full of water".
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