Drowning and suffocation. it has been estimated she was struggling for breath up to four hours after the fatal plunge. The body was found in the back seat of the car which suggests something fishy going on!
Mary Jo Kopechne was born on July 26, 1940 and died on July 18, 1969. Mary Jo Kopechne would have been 28 years old at the time of death or 71 years old today.