Supposedly all Poltergeist films were cursed. Besides both the daughters from part 1, from part 2:

Will Sampson - The Indian from part 2 died 1 year after the movie from post-operative kidney failure and pre-operative malnutrition problems.

Julian Beck - Creepy Henry Kane died from cancer.

I think there were 4 deaths in total-but could be more.
Spielberg, however, did just fine.