Margot Kidder.
(Image credit: Alberto E. Rodriguez/Getty Images)

Actress Margot Kidder, best known for starring as Lois Lane alongside Christopher Reeve in the Superman franchise, died Sunday, her representative told the Los Angeles Times on Monday. She was 69.

Kidder's representative said she died "peacefully" in her sleep at home in Montana. Born in Canada in 1948, Kidder got her start in acting on television, and in addition to four Superman movies, she starred in The Amityville Horror, Black Christmas, and The Great Waldo Pepper.

Kidder became a mental health advocate after she went through a public manic episode in 1996, which ended in her being discovered by a Los Angeles homeowner in his backyard. In 2001, Kidder was awarded the Courage in Mental Health Award from the California Women's Mental Health Policy Council. She is survived by daughter Maggie McGuane, granddaughter Maisie Kirn, and grandson Charlie Kirn.

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Catherine Garcia, The Week US

Catherine Garcia has worked as a senior writer at The Week since 2014. Her writing and reporting have appeared in Entertainment Weekly, The New York Times, Wirecutter, NBC News and "The Book of Jezebel," among others. She's a graduate of the University of Redlands and the Columbia University Graduate School of Journalism.