Mitchell lost her battle with cancer on 10 February (10). No further details have been released about her death.
The Louisiana-born novelist boasted a string of literary credits including A Wilderness of Monkeys, Love Is Not a Safe Country and The Covenant.
She also wrote and executive produced a string of U.S. TV shows and movies, including 1995 TV movie Young at Heart, Desperate for Love, in 1989, and Lies of the Heart: The Story of Laurie Kellogg, in 1994.
She is survived by her husband, Jeremy Tarcher, a daughter and two sons.