Diane, the eldest and the only biological daughter of Lillian and Walt Disney, died from the injuries that she had suffered from a fall in September.
Diane, the eldest and only biological daughter of Lillian and Walt Disney, helped in the development of Los Angeles' Walt Disney Concert Hall, which was designed by architect Frank Gehry and opened in 2004, reported Variety.
"We are deeply saddened by the loss of Diane Disney Miller and our thoughts are with her family during this difficult time," said Disney prexy and CEO Robert Iger.
"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."
Diane, who was married to Ron Miller, also helped in creating the Walt Disney Family Museum, which opened in San Francisco in 2009.
Her adopted sister, Sharon Mae Disney, died in 1993.