Wonder if he even was in the car when it left the bridge. How’d he escape? Out a window? The car flipped and went in top first.
Or if Mary Jo was heavily drugged or so badly injured such that even if Ted could clamber out a window, Mary Jo could not.
How convenient for Teddy that Mary Jo’s folks wanted to cover up the problem as badly as Teddy did.
I think Mary Jo’s parents were well paid for silence.
back then,a different world morally,she could have,as has been speculated,been pregnant which would have been a motivation for the parents to not want to look deeply.Perhaps even the hint and not even the reality would have been enough.