Lady Beware (1987)

Young and good-looking Katya (Diane Lane), a window dresser for a big department store in Pittsburgh, begins a love story with a journalist, Mac Odell (Cotter Smith). She is however stalked by Jack (Michael Woods), a married man who has a fixation with her. Jack makes Katya's life hellish and when she tells his wife about him he becomes wild with fury having been exposed and goes to the store to kill her…