She is survived by daughter Maggie McGuane.
Kidder appeared in 1978’s Superman, 1980’s Superman II, 1983’s Superman III and 1987’s Superman IV. Her most recent TV stint was a two-episode arc on ABC’s Brothers & Sisters in 2007. Margot Kidder, best known as Lois Lane to Christopher Reeve’s Man of Steel in the ’70s/’80s Superman films as well as Kathy Lutz in the fright classic The Amityville Horror, died Sunday at her home in Montana. She was 69. Kidder also guest-starred in more than two dozen TV series, including The Mod Squad, Murder, She Wrote, Barnaby Jones, Tales From the Crypt, Boston Common, Touched By an Angel and the WB/CW Superman prequel series Smallville. A cause of death is not known, but the actress had long struggled with mental illness.