Sanatorium

On New Year's Eve in 1955, Richard Howell, a patient at the Hillcrest Sanatorium, went on a bloody rampage, killing three children before he hanged himself.

Sanatorium is a 2013 mystery horror movie directed by Brant Sersen, starring Michael Cruger, Ellen Bucciarelli, Jean Diller. It holds an IMDb rating of 4.9/10 from 1,465 votes and runs 1h 30m.