Kidder's Lois was hard-nosed, independent and witty Daily Planet reporter who possessed an undeniable onscreen chemistry with Christopher Reeve; she edged out such actresses as Anne Archer, Lesley Ann Warren and Stockard Channing for the role.
The Canadian actress and activist, 69, passed away at her home in Montana on Sunday, May 13, according to TMZ.
No further details were given and messages left with Kidder's representatives were not immediately returned. It is still unclear if this was related to her death, but could have played a factor.
Reeve died in 2004 of complications from an infection, nine years after becoming a quadriplegic following a horse riding accident.
As news broke of Margot's death tonight, her Lois LaneSuperman co-star Teri Hatcher took to Twitter to pen a heartfelt message.
Lois Lane became her iconic role, which she would reprise in all three sequels, though her relegation to a walk-on part in III was an imbecilic decision on the part of the writers (and Superman IV was simply an imbecilic decision). I loved her in cult horrors "Sisters" and "Black Christmas".
She was unable to work for two years after serious auto crash in 1990, and eventually became bankrupt. The comic book movie was the most expensive project to be released at that point, costing $55 million and it was a huge critical and financial success.
As a sufferer of bipolar disorder, Kidder was an advocate for mental health and particularly supported orthomolecular medicine. When police found her in Glendale, Calif., she was hiding in the bushes behind a house. Her last movie was "The Neighborhood", and she had recently been awarded for her role in R. L. Stine's children show "The Haunting Hour".
She was unable to work for two years after serious auto crash in 1990. Kidder also acted on stage, including Broadway's 2002 production of The Vagina Monologues.
She suffered a highly publicized mental breakdown in 1996 after she disappeared for four days and spent time as a homeless person.
She is survived by her daughter.
She also had a string of high profile relationships including dating former Canadian Prime Minister Pierre Trudeau, directors Brian de Palma and Steven Spielberg, and comedian Richard Pryor.
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