Who played Matt dillon on radio?

There's a little confusion here. It's not clear if you're asking about a real person named Matt Dillon who had a radio show or a fictional character named Matt Dillon.

* If you're thinking about the real Matt Dillon, an actor, there was no radio show featuring him. He's best known for his roles in films like "Drugstore Cowboy," "Singles," and "There's Something About Mary."

* If you're thinking about the fictional character Matt Dillon, the Marshal from the TV series "Gunsmoke," he was voiced by James Arness on the radio show. The radio show aired from 1952 to 1961, preceding the television adaptation.

Could you clarify your question to help me provide a more accurate answer?