I Bury The Living (1958) | HORROR/MYSTERY | FULL MOVIE

Through a series of macabre "coincidences," the newly-elected director of a cemetery (Richard Boone) begins to believe that he can cause the deaths of living owners of burial plots by merely changing the push-pin color from white (living) to black (dead) on a large wall map of the cemetery that notes those plots.

IMDb: https://www.imdb.com/title/tt0051755