There is credible evidence that Mary Jo suffocated rather than drowned. She was found with her head positioned in an air pocket that may well have contained enough air to keep her alive long enough for help to arrive. Unfortunately for Mary Jo, The Swimmer never summoned help.
And, in a move VERY atypical for a Catholic in that day and age she was cremated.
I guess the family was pressured to avoid having it found out she was preggers with Teddy’s bastard.
I suppose once you’ve personally murdered a pregnant girlfriend to avoid embarrassment, consistently voting for taxpayers to pay for clinical abortions is a snap...