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George Walsh from Gunsmoke

Who was a regular on Gunsmoke the longest?

George Walsh started as the announcer on radio's Gunsmoke.
He then continued 20 more years on television's Gunsmoke.

Click on Walsh for the TV Guide article claiming his longevity.

James Arness, Milburn Stone & Howard Culver (The Dodge House Clerk) are tied for second at 20 years each.