John Truman Mantley (April 25, 1920 – January 14, 2003) was a Canadian theatrical actor, writer, director, screenwriter and producer of the long-running television series, Gunsmoke, and was Mary Pickford's cousin.
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"John Mantley" Scripts.com. STANDS4 LLC, 2020. Web. 22 Jan. 2020. <https://www.scripts.com/writer/john_mantley/11531>.
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