Don't Answer the Phone! (movie, 1980)

A deeply disturbed photographer and Vietnam veteran, named Kirk Smith, terrorizes Los Angeles by going around strangling lingerie-clad young women in their homes while taunting Lindsay Gale, a young psychologist, by calling her on a radio call-in show to describe his sexual hang-ups and misogynistic ways, while a local police detective, Lt. McCable, is always two steps behind in trying to catch the psycho.