According to her manager, the actress died peacefully in her sleep.
The actress died on Sunday in her home in the northern U.S. state of Montana, according to the Franzen-Davis Funeral Home & Crematory, which did not specify a cause.
Margot Kidder, the Canadian actress who starred as a salty and cynical Lois Lane opposite Christopher Reeve in the Superman film franchise of the 1970s and 1980s, has died.
While Kidder was born in Yellowknife in the Northwest Territories, she spent some of her childhood years in Labrador City.
Apart from Superman films, she was also known for cult classics like Black Christmas and Sisters.
News broke Monday that Kidder, who played Lane in 1978's "Superman" - alongside Christopher Reeves' Clark Kent - and its sequels, had died at her home Sunday.
In 1982, Kidder has starred in the commercially successful film "what a hero", and then returned to Canada, playing a major role in the film "heartaches", and received its third award for "Gini". "Nothing prepares anyone for that sudden thing of being world famous, it was such a shock", she said. She was 69 years old.
"They took one of the best American actresses around, Amy Adams, and didn't give her anything to do!"
In the spring of 1996, Kidder was again in the spotlight thanks to her wild accusations against her of conspiracy is built, and then disappeared for three days and was found in one of the courtyards of the Glendale (CA), dressed in rags and utters an incoherent phrase.
"Dana Delany, who voiced Lois Lane in numerous animated projects including the "Batman", Superman" and "Justice League" series, posted a photo of Kidder and Reeve along with a broken heart and the words "Iconic Lois". A spark of vivacious life in all of her films. Was married three times. She is survived by her daughter Maggie McGuane. The first marriage was with writer Thomas Mukhwana in 1975-1976, the second with actor John Hardon (1979), and the third with Director Philippe de Broca (1983-1984).