Dead Margot Kidder: Cause of death of Superman actress who played Lois Lane & # 39; s revealed

The death of Superman actress Margot Kidder has been declared suicide by drug overdose.

The actress was found dead at her home in Montana in May at the age of 69.

His coroner revealed on Wednesday that his death was the result of a "self-inflicted drug and alcohol overdose."

It has not been revealed what drugs he took.

Margot had previously fought against bipolar disorder, which causes a person to have extremely elevated mood swings, for many years and has been open to the public about their problems.

In 1996, her fight against the disorder became so intense that she was temporarily homeless after a collapse that led to her disappearance for four days.

She was found shortly after in the backyard of a homeowner and was taken by the Los Angeles Police Department to Olive View Medical Center in a manic state.

Days after the event, she was placed in a psychiatric care center.

Margot Kidder speaks at a public event Albert L. Ortega / Getty Images

SAD PASSING: Superman Margot's actress was found dead at her house in May of this year

Actress Margot Kidder poses for a portrait in 1985 in Los Angeles, California. Harry Langdon / Getty Images

CAUSE OF DEATH: a coroner has revealed that Margot died after committing suicide

In her later life, she became an advocate for mental health.

In a joint statement, Margot's family and the Park County coroner's office said they are urging "those suffering from mental illness, addictions and / or suicidal thoughts to seek appropriate counseling and treatment."

The actress was best known for her role as Lois Lane in four of the Superman films during the 70s and 80s, in which she starred opposite the late Christopher Reeve.

He also appeared in The Great Waldo Pepper with Robert Redford in 1975 and The Amityville Horror in 1979, as well as in several episodes of Law & Order: Special Victims Unit and Smallville.

Margot Kidder and Christopher Reeve during the presidential premiere of & # 39; Superman & # 39; in Washington, D.C. - December 10, 1978 at the JFK Center for the Performing Arts,Ron Galella / WireImage

TURBULANTE: Margot has had some difficult years before taking her own life this year

Margot Kidder during the Big Apple Comic Book, Art, Toy and Horror Expo 2006Robin Platzer / FilmMagic

MENTAL HEALTH: Margot became an annual mental health advocate after battling bipolar disorder

Margot was married three times, with the American novelist Thomas McGuane, the actor John Heard, whom he married in 1979 but separated from him six days later, and the French film director Philippe de Broca from 1983 to 1984.

He is survived by his daughter Maggie, 41, whom she shared with her first husband.

For confidential assistance, call the Samaritans in the United Kingdom at 116 123 or visit a local Samaritans branch.