Killer McCoy is a 1947 American sports drama film about a boxer starring Mickey Rooney.

The picture was directed by Roy Rowland with a supporting cast featuring Brian Donlevy, Ann Blyth, James Dunn, Tom Tully, and Sam Levene.

His success catches the attention of champion boxer Johnny Martin and leads to a slow but steady climb in professional boxing as Tommy puts on weight and muscle and qualifies for lightweight matches.

While training at a Connecticut estate, Tommy meets Sheila Carson, who turns out to be Caighn's daughter, apparently unaware of her supposedly respectable father's gambling activities under a different name.

Mickey Rooney had intended to appear in a biopic of jockey Tod Sloan but when that was postponed MGM put him in this.

[5] By June, Taylor had been replaced by Ann Blyth due to script revisions that changed the age of her character.