Kidder began acting in the late 1960s, but 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).
The actor worked steadily through the 1980s, though issues with bipolar disorder resulted in a tumultuous personal life and a highly publicised breakdown in 1996 in which she disappeared for four days. She subsequently turned to social and political activism, becoming an organiser for the Progressive Democrats of America and writing numerous articles for left-leaning publications.
She is survived by her daughter, Maggie.
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