In a statement provided to The Associated Press, Coroner Richard Wood of the Park County Coroner's Office in Montana where Kidder lived said her death in May at the age of 69 was "a result of a self-inflicted drug and alcohol overdose". The star is survived by her 41-year-old daughter Maggie, whom she had with her first husband.
"It's important to be open and honest so there's not a cloud of shame in dealing with this", she continued.
The coroner did not specify what drugs she took.
It's noted that Margot Kidder struggled with mental illness throughout much of her life, which was made worse in a auto accident in 1990 that left her in debt and wheelchair bound for near two years. She also had two more roles yet to be released, TMZ reported. At the time Kidder's manager, Camilla Fluxman Pines, said she had died peacefully in her sleep. I want what I know about her to be out there because it was glorious. She returned to the world of Superman in the 2000s with periodic guest appearances on Smallville. She went missing for four days before being discovered in a Los Angeles homeowners' backyard. You can listen to the interview below.More news: Perseid meteor shower peaks this weekend - here’s how to watch
The news was confirmed to the AP by Kidder's daughter, Maggie McGuane.
Born Margaret Ruth Kidder on October 17, 1948 in Canada's Northwest Territories, she grew up in a small town without a movie theatre. She also noted Montana's high suicide rate and the empathy she feels for the people there going through the same thing. And it appears that now she's passionate about helping others who have lost loved ones through suicide.
Both Kidder and co-star Christopher Reeve, who played Superman, were relative unknowns when they got their leading parts, and neither saw many major roles afterwards.