Relentless

Relentless is a 1989 American crime film directed by William Lustig and starring Judd Nelson, Robert Loggia and Leo Rossi. The film follows two LAPD officers on a hunt for an ex-cop turned serial killer. Relentless was the first in a series of four films starring Leo Rossi as detective Sam Dietz trying to stop a serial killer. The three sequels were all filmed and released within three consecutive years from 1992 to 1994.