Have Gun, Will Travel (1957)

S06E11 Marshal of Sweetwater

Sweetwater was once a lawless place until Thomas Carey, a former Army scout and a close friend of Paladin, became the marshal. However, Carey has since seized total power and has transformed into a ruthless killer. Paladin now faces the daunting task of bringing Carey to justice, knowing that his old friend has always had the edge in speed.