For the 1974 film alternatively released as "Born to Kill", see Cockfighter.

Born to Kill is a 1947 film noir starring Lawrence Tierney and directed by Robert Wise. It was the first film noir to be directed by Wise, who later directed The Set-Up (1949), The Captive City (1952), and Odds Against Tomorrow (1959). The film also features Claire Trevor, Walter Slezak, and Elisha Cook Jr..

Plot

Helen Brent (Claire Trevor) has just received a Reno divorce. That night, she discovers one of her neighbors, Laury Palmer, and a gentleman caller murdered in Palmer's home. The killer is her neighbor's other boyfriend, Sam Wilde (Lawrence Tierney), an insanely jealous man who won't abide anyone "cutting in" on him. Helen discovers the bodies, but says nothing to the police; she's leaving town and doesn't want to be impeded. She meets Sam on the train, and she is instantly attracted to his self-confidence and brutality, but she is engaged to marry a wealthy boyfriend, Fred (Phillip Terry). Helen's foster sister (Audrey Long) is also rich, and Sam soon shifts his attentions to her, marrying her for her money after a whirlwind romance. Neither Helen's engagement nor Sam's marriage is an impediment to their beginning an affair.

Meanwhile, back in Reno, the owner of the boarding house where Helen lived has hired a mercenary, verse-quoting detective, played by Walter Slezak, to find out who killed Laury. The detective follows Sam's friend, Marty (Elisha Cook Jr.), to San Francisco, and soon begins to make blackmailing overtures to Helen. Marty finds out who hired the detective and attempts to kill her, but Sam thinks he's trying to cut in on his action and kills Marty. Fred is troubled by the resulting police investigation and breaks it off. Sam and Helen face off in a fatal confrontation as their schemes begin unraveling, with Sam killing Helen before he is slain by police.