Diana, who appeared in dozens of films and TV shows including "Planes, Trains and Automobiles", "ER" and "The West Wing", died of cancer in a retirement home on July 3.
Her husband of 13 years, Donald Webster, confirmed the death of the actress.
She was the first wife of actor Kirk Douglas and was married to the legendary actor from 1943 until their divorce in 1951. She had two sons, Michael and Joel, with Kirk.
She appeared with her ex-husband and elder son in the 2003 film "It Runs in the Family". The film marked her final big screen appearance.
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She began her career with Warner Bros, and modelled on the cover of Life Magazine in 1943.
Diana was married to actor Bill Darrid from 1956 until his death in 1992. She later married Webster in 2002.
The actress officially retired from showbiz in 2008 at the age of 85.