Kidder and Reeve went on to star in three more "Superman" movies, the last being "Superman IV: The Quest for Peace", in 1987. During that time, the actress, who was diagnosed with bipolar disorder, went into a manic state and disappeared for four days with her teeth deliberately knocked out.
Known for playing strong female characters, Kidder sharpened her skills on television shows like "McQueen", "Nichols", "Banacek", and "Mod Squad" before finding her place in movies, according to National Public Radio.
But Superman, her return to moviemaking, rocketed her to a new level of fame.
Indie film director Ted claims that Margot asked him to keep her wish until her death.
The year after the original Superman was released, she starred in another box-office smash, The Amityville Horror, in which she and James Brolin played a couple doing battle with a possessed house.
The actress was famous for her role as Lois Lane in the franchise of the 1970s and 1980s "Superman".
DC Comics, creators of Superman, appreciated her for the role, that so many people came to identify her with, in the 70s and 80s.
Park County Attorney Bruce Becker told TMZ police found her dead after a person of unknown identity called police to report that Margot was unconscious and wasn't breathing.
Kidder was married and divorced three times, including a brief marriage to actor John Heard.
"It was exciting, but for a while being typecast as Lois made my vanity and narcissism scream", Kidder stated in the interview.
He touchingly added: "I totally would have dragged you up the hill". She became convinced that her first husband, author Thomas McGuane, was trying to kill her with the help of the Central Intelligence Agency.