Her death was announced by Franzen-Davis Funeral Home and Crematory, which did not specify the cause.
Kidder began her acting career in her 20s and shot to worldwide fame playing the intrepid reporter Lois Lane in 1978's "Superman", opposite Christopher Reeve. Police responded and found her dead.
Sad news for lovers of superhero cinema, as it has been announced that Margot Kidder, star of the original Superman, has died.More news: Israel's Netta wins Eurovision Song contest
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While the role of the Daily Planet's roving reporter beloved of Superman is of course the part Kidder has always been best remembered for, she also had key roles in a number of acclaimed and influential horror movies: Brian De Palma's 1973 film Sisters, 1974 slasher Black Christmas, and 1979 haunted house movie The Amityville Horror. Kidder eventually reemerged with a less prolific work schedule, and only a few years ago, she won an Emmy for her work on 2014's R.L. "Some of us made more of a fuss than others-me in particular-so you could tell the joy [of working together] in all our faces, in the first one in particular and half of the second one".
After a highly publicized manic episode and nervous breakdown in 1996, Kidder's career began to slow.
Kidder, who became an American citizen, had settled in Montana to live in a "culture-free zone" away from the spotlight and close to her daughter and grandchildren.