The Boogey Man (1980)

After the brutal death of their mother's boyfriend, young siblings Willy and Lacey had moved out of their mother's house n been staying with their uncle n aunt for the past twenty years. Lacey is married with a young son and Willy has been mute since the night of the murder. Lacey's husband, Jake, takes her to a psychiatrist to help her confront her fears, and after the psychiatrist's advice, Jake n Lacey visit the house where the murder took place. Lacey sees a reflection of her mother's deceased boyfriend coming towards her in a mirror inside the bedroom where he died, and smashes the mirror in a panic with a chair thereby releasing the vengeful spirit of the deceased lover from the mirror.

IMDb: https://www.imdb.com/title/tt0080464