Margot Kidder died Sunday, May 13, 2018 at her home in Livingston, Montana the age of 69, according to People. The reported cause of death has not been released.

Kidder was born Margaret Ruth Kidder in Yellowknife, Northwest Territories, Canada on October 17, 1948. She began acting in 1968 with The Best Damn Fiddler from Calabogie to Kaladar, but rose to fame with roles in 1970's Quackser Fortune Has a Cousin in the Bronx, 1973's Sisters, and 1975's The Great Waldo Pepper.

In 1976, Kidder was cast for what would become her most iconic role - Lois Lane in 1978's Superman: The Movie. Starring opposite Christopher Reeve's Superman, Kidder won a Saturn Award for her role and subsequently reprised it in three sequels.

Kidder is survived by one daughter and two grandchildren.