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Superman's Lois Lane, Margot Kidder, Dies at Age 69

People logo People 5/14/2018 Stephanie Petit

The big screen’s Lois Lane has died.

Margot Kidder passed away on Sunday at her home in Livingston, Montana, PEOPLE has confirmed. She was 69. Her cause of death is unknown.

Margot Kidder © Allstar/WARNER BROS/REX/Shutterstock Margot Kidder Funeral arrangements for the Canadian-born actress are pending.

Margot Kidder and woman posing for a picture © Warner Bros/DC Comics/Kobal/REX/Shutterstock Margot Kidder Kidder rose to fame in 1978 for her role as Lois Lane in Superman: The Movie opposite Christopher Reeve. She went on to reprise the part in the movie’s three sequels. 

She also starred as Kathy Lutz in The Amityville Horror (1979), and appeared in movies such as Black Christmas (1974) and Heartaches (1981). Kidder acted as producer and starred as Eliza Doolittle in a 1983 adaptation of Pygmalion with Peter O’Toole for Showtime.

Despite her success, Kidder battled mental health issues that left her homeless.

Margot Kidder smiling for the camera © Harry Langdon/Getty Images After being reported missing for days in 1996, police took her away in handcuffs to Olive View-UCLA Medical Center.

“The woman we saw was in obvious mental distress,” Officer Rick Young of the Glendale police told PEOPLE at the time. “She didn’t think one person was following her. She thought a whole group of people were after her.”

Margot Kidder holding a guitar © Tara Walton/Toronto Star via Getty Images Margot Kidder

Kidder told PEOPLE five months later that the root of most of her problems — which included “mood swings that could knock over a building” — was manic depression. She was first diagnosed with the condition by an L.A. psychiatrist eight years prior, but she refused to take the recommended prescription of lithium, the recommended treatment.

Margot Kidder posing for the camera © Mickey Adair/Getty Images Margot Kidder “It’s very hard to convince a manic person that there is anything wrong with them,” said Kidder, who was working on a memoir at the time. “You have no desire to sleep. You are full of ideas.”

She is survived by her daughter, Maggie McGuane. 

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