Kidder, who played opposite Christopher Reeve's Superman in the classic superhero movie, was found dead by a friend in her Montana home on May 13.
In a statement to the Associated Press, Kidder's daughter Maggie McGuane said the family decided to make her mother's suicide public because "it's important to be open and honest about the suicide so there's no cloud of shame".
But now her daughter, Maggie McGuane, has revealed that her mom committed suicide. She told the AP she believes it's important to be open and honest about Kidder's suicide so neither her nor her family faces a cloud of shame as a result.
Kidder said at the time she was first diagnosed with bipolar disorder eight years earlier, but refused to take the lithium that was prescribed to her. "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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Kidder was best known as her role as Lois Lane in the Superman movies in the 1980s. She went on to appear in small films and television shows until 2017, including an appearance on R.L. Stine's The Haunting Hour. Kidder also had notable roles in the original Black Christmas and Amityville Horror.
Kidder, originally from Yellowknife, Canada, was a political activist who was arrested in 2011 in a Washington DC protest over the proposed Keystone XL pipeline from Canada's oil sands. The Park County Coroner has released her cause of death. A friend discovered Kidder's body at her home on May 13th.
"They are a stigma and recall times when it was thought those with a disorder were possessed by the devil", she told the Edmonton Journal. "She was really a blazing energy".
If you or someone you know needs help call Lifeline on 13 11 14 or the Suicide Call Back Service on 1300 659 467.