What is the guy s name, in the rifleman, that was a villian, and her wore a black hat and jacket, and he turned into a doctor?

Update: In the show, The Rifleman, with Chuck Connors, the Rifleman meets up with this bad guy, and the bad guy has a Black hat and Black jacket, and he has silver guns in his holsters, and he helped this other bad guy out. What was the name of the actor?
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