Margot Kidder, who played Lois Lane in four Superman films between 1978 and 1987, has died at the age of 69.
TMZ reports that the actor died in her home in Livingston, Montana.
The actor also appeared in Sisters, Black Christmas, The Great Waldo Pepper and The Amityville Horror but she gained fame around the world for being the starring female in the Superman series.
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She told HeyUGuys that she never expected the superhero films to land with audiences, saying: "I remember when we were making it I thought it was going to be a flop. A lot of it was arduous and dull.
"The flying I didn't think would work either. Nothing prepares anyone for that sudden thing of being world famous, it was such a shock.
"It wasn't something I really liked or something I was very good at. I didn't realise how good the movie was until I seen it at the premier in Washington.
Naturally, she became good friends with the guy who played the superhero, Christopher Reeve, and they stayed close up until his death in 2004.
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When asked about her relationship with Reeve, she told CBS: "When you're strapped to someone hanging from the ceiling for months and months, you get pretty darned close.
"He was such a huge part of my life...He was complicated, very smart, really smart, and he knew he'd done something meaningful. He was very aware of that and very happy with that role."
Kidder was diagnosed with bipolar disorder and depression and had a very public manic episode in 1996.
She had reportedly been working on an autobiography for three years and her computer became infected with a virus - effectively erasing all her work up until that point. The actor went missing for four days and was eventually found in someone's backyard with her dental work missing and dressed in dirty clothes.
Kidder was taken to Olive View Medical Center by the police and was eventually placed in psychiatric care. Speaking to People about the breakdown, she said: "I was like one of those ladies you see talking to the space aliens on the street corner in New York.
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"It's very hard to convince a manic person that there is anything wrong with them. You have no desire to sleep. You are full of ideas."
While she was very famous for the work she did in the 70s and 80s, she worked almost all the way up until her death. Margot's final role was just last year in The Neighbourhood where she played Maggie.
She won an Emmy Award for Outstanding Performer in Children's Programming in 2014 for her role in R.L. Stine's The Haunting Hour - proving that she was an incredible actor throughout her career.
Featured Image Credit: Warner Bros/ColumbiaTopics: Superman