Shock Corridor

Shock Corridor is a movie starring Peter Breck, Constance Towers, and Gene Evans. Bent on winning a Pulitzer Prize, a journalist commits himself to a mental institution to solve a strange and unclear murder.
With the help of his girlfriend Cathy and Dr. Fong, a psychiatrist, ambitious journalist Johnny Barrett poses as a madman in order to be admitted to a mental institution where a bloody murder has been committed.