A notorious outlaw and Flagg's arch-rival. Initially leading a gang of youthful outlaws, he is captured by Flagg but later switches sides to help stop the train robbery. He plays a crucial role in hijacking the locomotive, uncoupling the cars, and surviving the cliff jump. He ultimately kills the gang leader Waco.
Flagg and McKay are long-standing enemies and professional rivals.
Waco usurps command from McKay and is ultimately executed by him.
Mary provides shelter for McKay while he is detained in town.
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