The Screaming Skull-Peggy Webber, John Hudson-1958 IMDB 4/10

Newlyweds Eric and Jenni Whitlock retire to his desolate mansion, where Eric's first wife Marianne died from a mysterious freak accident. Jenni, who has a history of mental illness, begins to see strange things including a mysterious skull, which may or may not be a product of her imagination. Suspicion falls on Mickey, the estate's mentally challenged gardener, who seemingly was very attached to his former mistress.