The Walt Disney Family Museum shared the news of Ron Miller's death on twitter.
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Miller was also the President of the Board of Directors at the Museum, and the owner of Silverado Vineyards in Napa.
He married Walt Disney's daughter Diane in 1954 and played professional football for the Los Angeles Rams.
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Later his father-in-law hired him to work at Disney.
Ron Miller was 85-years-old.