Relentless is a 1989 film directed by William Lustig. Experienced but cynical detective Bill Malloy (Robert Loggia) is teamed up with Sam Dietz (Leo Rossi), a cocky rookie detective who has recently moved from New York to Los Angeles. The pair are tasked with stopping a former cop, Arthur "Buck" Taylor (Judd Nelson), who, as a result of his frustration at being rejected by the police department on psychological grounds and society in general has turned bad and become a serial killer. Taylor chooses his victims by randomly looking them up in a telephone directory. The task of the detectives to find Taylor is made more difficult by the killer's skills in covering his tracks gained as a result of his years of experience in the police force. In a break with the normally random way that he selects his victims, Taylor targets Dietz and Malloy as the next to die as the film progresses towards a deadly climax.