Now, the Associated Press reports that a statement released Wednesday by Park County coroner Richard Wood reveals that Kidder "died as a result of a self-inflicted drug and alcohol overdose".
But she didn't say anything until the coroner released an official statement.
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For years, Kidder lived with bipolar disorder and became an advocate for raising awareness about mental health.
Kidder's longtime friend, Joan Kesich, who found her body, called the actress and activist "fearless". The star is survived by her 41-year-old daughter Maggie, whom she had with her first husband. She believes it is important to be open and honest about suicide and not hide it.
At the time, Kidder's manager, Camilla Fluxman Pines, said Kidder died peacefully in her sleep. She also noted Montana's high suicide rate and the empathy she feels for the people there going through the same thing. "Knowing how many families in this state go through this, I wish that I could reach out to each one of them".
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She rose to fame as Lois Lane in 1978's Superman, and followed that massive success with Superman II in 1980, Superman III in 1983 and Superman IV: The Quest for Peace in 1987. She wants to avoid any "cloud of shame".
Her most-publicized mental health episode came in 1996 when she disappeared for four days, according to Toronto's Globe and Mail newspaper, living among the homeless on the streets of Los Angeles until she was found by a homeowner in the Los Angeles suburb of Glendale, who found the celebrity actress cowering in her backyard. Additionally, ambulances were called to Kidder's home five times in seven months, including at the time of her death.
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