A long-standing fan theory about Adam and Barbara’s deaths gives Beetlejuice an even more sinister twist, which could also impact the upcoming movie sequel. Beetlejuice primarily focuses on the dead’s integration into the afterlife within Tim Burton’s spooky world, with Adam and Barbara Maitland (Alec Baldwin and Geena Davis) meeting tragic ends in the opening sequence of the 1988 horror comedy. The Maitlands die when a dog walks in front of their car, leading them to swerve off a bridge and into the river below. However, a dark theory claims there’s more to this tragedy than the movie lets on.
https://screenrant.com/beetlejuice-theory-adam-barbara-killed-jane-dark/