Mortuary

Mortuary is a 1982 American slasher film directed by Howard Avedis and starring Mary Beth McDonough, Bill Paxton, David Wallace, Lynda Day George, and Christopher George in his final film role before his death. It follows a young woman who, while investigating the death of her father, exposes disturbing secrets surrounding a local mortuary.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.