McKinnon Miller was born in Rockford, Minnesota, on February 21, 1960. He took opera singing lessons as a youth, and later attended the University of Minnesota Duluth, where he studied theatre. He dropped out in 1980, a few credits short of graduating, but returned to his alma mater to finish his degree in 2007. Prior to Big Love, McKinnon Miller's main television role was that of Lyle Nubbin in three episodes of Las Vegas.

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