She appeared in a 1950 episode of The Lone Ranger entitled "Bullets for Ballots" also featuring Craig Stevens.
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In 1964, McMahon played Hank McClure, a police contact in the 13-week CBS drama series, Mr. Broadway, with Craig Stevens.
After that, she became head of Sutherland when Frost departed, also coaching the likes of Craig Stevens, Ky Hurst and Kirsten Thomson.