According to The Walt Disney Family Museum, Miller died Tuesday of complications from a fall.
"We are deeply saddened by the loss of Diane Disney Miller and our thoughts are with her family during his difficult time," Disney President and CEO Bob Iger said in a statement. "As the beloved daughter of Walt Disney and one of his inspirations for creating Disneyland, she holds a special place in the history of The Walt Disney Company and in the hearts of fans everywhere. She will be remembered for her grace and generosity and tireless work to preserve her father's legacy, and she will be greatly missed by all who knew her."
Miller and her husband, Ron, have seven children. She was a key proponent for the construction of the Walt Disney Concert Hall in downtown Los Angeles.
She also helped to preserve her father's legacy with the creation of the Walt Disney Family Museum, which opened in San Francisco in 2009.