555

555 is a 1988 American horror film directed by Wally Koz and written by Roy Koz. A direct-to-video release, it stars Mara Lynn Bastian, Charles Fuller, Greg Kerouac, Greg Neilson, B.K. Smith, and Bob Grabill. The plot involves the police searching for a murderous necrophile who, every five years, murders five couples over the course of five nights, with the latest killing spree taking place in Chicago, Illinois.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.