No further details were given and messages left with Kidder's representatives were not immediately returned. Her manager Camilla Fluxman Pines said she died peacefully in her sleep, without saying what the cause of death had been.
Reeve, who was paralyzed from the neck down in a horseback riding accident in 1995, died in 2004. She also starred in the three sequels that followed. Both Reeve and Kidder were relative unknowns when they were cast in the superhero franchise opposite big stars including Gene Hackman, Ned Beatty, Marlon Brando, Glenn Ford and Jackie Cooper.
She fought through her illness and continued working, however, appearing in small films and television shows and amassing credits until 2017, most notably R.L. Stine's The Haunting Hour, which earned her a Daytime Emmy Award as outstanding performer in a children's series in 2015. After a trip to NY that included seeing a stage production of Bye, Bye Birdie, she first got the idea to try acting.
Margot was married three times, but sources claim she had been single since the late 1980s. She was found in a backyard by a homeowner and was taken by the Los Angeles Police Department to Olive View Medical Center in a distressed state, the caps on her teeth having been knocked out during a rape attempt.
Kidder also starred in The Amityville Horror, appeared in TV's Law & Order and had a two-year run in The Vagina Monologues. She was never really allowed to capitalise on her early success, but she'll never be forgotten for taking one of the most famous "girlfriend" roles of them all and making something unique and extraordinary out of it.
She was unable to work for two years after serious auto crash in 1990.
Kidder became an American citizen in 2005 as well as an outspoken activist against the Iraq War.
She is survived by a daughter. She was also famously linked to former Canadian prime minister Pierre Trudeau.
She suffered from bipolar disorder, which led to a brief stint of homelessness in the 1990s, and became an advocate for mental health.
Sports betting in Colorado could be a long shot
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Nobel Literature Prize postponed amid sex scandal
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Title Match Added To WWE Money In The Bank
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