Margot Kidder’s death ruled a suicide

Superman” actress Margot Kidder’s death has been ruled a suicide, according to the Associated Press.

Kidder’s daughter, Maggie McGuane, told the publication on Wednesday that she knew her mother had died by suicide when she went to her home in Livingston, Mont.

Kidder died in her sleep on May 13 from what Park County Coroner Richard Wood said in a statement was the result of “a self-inflicted drug and alcohol overdose.”

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'Superman' actress Margot Kidder throughout her career
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'Superman' actress Margot Kidder throughout her career
Portrait of actress Margot Kidder. (Photo by Herbert Dorfman/Corbis via Getty Images)
Christopher Reeve as Superman (left) and as Clark Kent (right) with Lois Lane, played by Margot Kidder, in the 1978 film Superman: The Movie.
NICHOLS -- 'Nichols' Episode 101 -- Pictured: Margot Kidder as Ruth -- (Photo by: Gary Null/NBC/NBCU Photo Bank via Getty Images)
ABC MOVIE FOR TV - 'The Bounty Man' - Airdate: October 31, 1972. (Photo by ABC Photo Archives/ABC via Getty Images) JOHN ERICSON;MARGOT KIDDER
Margot Kidder relaxing on the couch in a scene from the film 'Sisters', 1973. (Photo by American International Pictures/Getty Images)
CANADA - APRIL 17: Margot Kidder; who was born in Vancouver; has just finished filming The Geat Waldo Pepper; which stars Robert Redford. The 25-year-old actress is in Toronto to shoot a horror flick; Black Christmas. (Photo by Dick Darrell/Toronto Star via Getty Images)
UNITED STATES - JULY 07: Christopher Reeve and Margot Kidder filming 'Superman' at the New York Daily News building at 220 E. 42nd St. (Photo by Harry Hamburg/NY Daily News Archive via Getty Images)
UNITED STATES - JULY 07: Christopher Reeve and Margot Kidder during filming of 'Superman' on 42nd St.. (Photo by Harry Hamburg/NY Daily News Archive via Getty Images)
WASHINGTON,DC. - DECEMBER 10: Actress Margot Kidder attends the Presidential Premiere of 'Superman' on December 10, 1978 at Eisenhower Theater at the John F. Kennedy Center for the Performing Arts in Washington, DC. (Photo by Ron Galella/WireImage)
Christopher Reeve and Margot Kidder at the JFK Center for the Performing Arts, Eisenhower Theater in Washington, D.C., (Photo by Ron Galella/WireImage)
Margot Kidder and Christopher Reeve (Photo by Ron Galella/WireImage)
LOS ANGELES, CA - CIRCA 1979: Christopher Reeve, Margot Kidder and Giorgio Moroder circa 1979 in Los Angeles, California. (Photo by Bret Lundberg/IMAGES/Getty Images)
BEVERLY HILLS,CA - MARCH 7: Actress Margot Kidder attends the Seventh Annual American Film Institute Lifetime Achievement Award Salute to Alfred Hitchcock on March 7, 1979 at Beverly Hilton Hotel in Beverly Hills, California. (Photo by Ron Galella/WireImage)
Margot Kidder and Christopher Reeve during 51st Annual Academy Awards at Dorothy Chandler Pavilion at the L.A. Music Center in Los Angeles, CA, United States. (Photo by Ron Galella/WireImage)
UNITED STATES - circa 1980: Actress Margot Kidder. (Photo by The LIFE Picture Collection/Getty Images)
NEW YORK - AUGUST 1: Margot Kidder poses for a candid photo August 1, 1980 in New York City while campaigning for John Anderson for President. (Photo by Yvonne Hemsey/Getty Images)
NEW YORK CITY - AUGUST 12: Margot Kidder attends Democratic Fundraising Benefit Party for Mark Green on August 12, 1980 at the Empire State Building in New York City. (Photo by Ron Galella, Ltd./WireImage)
Actress Margot Kidder, wearing pink gown w. white accents, in Press Room at Academy Awards. (Photo by John Paschal/DMI/The LIFE Picture Collection/Getty Images)
THE 55TH ANNUAL ACADEMY AWARDS - Broadcast Coverage - Airdate: April 11, 1983. (Photo by ABC Photo Archives/ABC via Getty Images) MARGOT KIDDER AND WILLIAM SHATNER, PRESENTERS BEST ART DIRECTION
Margot Kidder sur le tournage du film 'Louisiane' r�lis�par Philippe de Broca en mai 1983 aux Etats-Unis. (Photo by Micheline PELLETIER/Gamma-Rapho via Getty Images)
LOS ANGELES - 1985: Actress Margot Kidder poses for a portrait in 1985 in Los Angeles, California. (Photo by Harry Langdon/Getty Images)
NEW YORK CITY - APRIL 28: Actress Margot Kidder attends the 'Command Performance Benefit for the Millay Colony for the Arts' on April 28, 1986 at St. Regis Hotel in New York City, New York. (Photo by Ron Galella, Ltd./WireImage)
NEW YORK CITY - JULY 7: Musician Steve Jordan and Actress Margot Kidder attend the New York City Premiere of 'A Fish Called Wanda' on July 7, 1988 at Walter Reade Auditorium at Lincoln Center in New York City, New York. (Photo by Ron Galella, Ltd./WireImage)
NEW YORK CITY - NOVEMBER 28: Actress Margot Kidder attends the Third Annual Better World Society Gala on November 28, 1988 at Waldorf-Astoria Hotel in New York City, New York. (Photo by Ron Galella, Ltd./WireImage)
NEW YORK CITY - JUNE 25: Actress Margot Kidder attends the New York Women in Film's Third Annual Softball Game on June 25, 1990 at Heckscher Playground at Central Park in New York City, New York. (Photo by Ron Galella, Ltd./WireImage)
LOS ANGELES - JULY 13: Actress Margot Kidder attends the 'National Cable Forum Press Tour' on July 13, 1990 at Century Plaza Hotel in Los Angeles, California. (Photo by Ron Galella, Ltd/WireImage)
NEW YORK CITY - OCTOBER 21: Actress Margot Kidder attends the 'Walden Woods Project Benefit Concert - After Party' on October 21, 1991 at Tavern on the Green in New York City, New York. (Photo by Ron Galella, Ltd./WireImage)
THE TONIGHT SHOW WITH JAY LENO -- Episode 1031 -- Pictured: (l-r) Actress Margot Kidder with host Jay Leno during an interviewon November 14, 1996 -- (Photo by: Margaret Norton/NBC/NBCU Photo Bank via Getty Images)
Story is about Margot Kidder and how her life with mental illness. She is in LA to promote a new mental health film. 023087.SO.0118.kidder.2 Margot Kidder at the Universal Sheraton Hotel in Universal City. (Photo by Annie Wells/Los Angeles Times via Getty Images)
Margot Kidder at the Beverly Garland Holiday Inn in Hollywood, California (Photo by Victor Spinelli/WireImage)
Superman's 'Lois Lane', Margot Kidder at the Venue: Donald E. Stephens Convention Center in Chicago, Illinois (Photo by Barry Brecheisen/WireImage)
Margot Kidder and Richard Donner at the The Director's Guild Theater in West Hollywood, CA (Photo by Albert L. Ortega/WireImage)
UNITED STATES - MARCH 01: BROTHERS & SISTERS - 'Three Parties' - Nora's romantic life takes an upturn when her troublemaking friend (guest starring Margot Kidder as Emily Craft) convinces her to take a chance with her professor (guest starring Peter Coyote as Mark August). Meanwhile, Chad comes to terms with his sexuality at Kevin's expense and Justin steps up to protect his half-sister, on 'Brothers & Sisters,' SUNDAY, APRIL 8 (10:01-11:00 p.m., ET), on the ABC Television Network. (Photo by Gale Adler/ABC via Getty Images)
HOLLYWOOD - AUGUST 24: Actress Margot Kidder arrives at the premiere of Dimension Films' 'Halloween II' held at Grauman's Chinese Theater on August 24, 2009 in Hollywood, California. (Photo by Alberto E. Rodriguez/Getty Images)
August 9, 2010-MARGOT KIDDER-Iconic actress Margot Kidder, poses for a photo Monday August 9, 2010 inside of Toronto's Panasonic Threatre. Kidder is in Toronto to star in 'Love, Loss and What I Wore' an intimate collection of stories by Nora Ephron and Delia Ephron, based on a book by Ilene Beckerman. Toronto Star/Tara Walton (Photo by Tara Walton/Toronto Star via Getty Images)
PHILADELPHIA, PA - JUNE 18: Actress Margot Kidder attends Wizard World's Philadelphia Comic Con 2011 at the Pennsylvania Convention Center on June 18, 2011 in Philadelphia, Pennsylvania. (Photo by Gilbert Carrasquillo/FilmMagic)
ANAHEIM, CA - APRIL 04: Actress Margot Kidder attends day 2 of WonderCon Anaheim 2015 held at Anaheim Convention Center on April 4, 2015 in Anaheim, California. (Photo by Albert L. Ortega/Getty Images)
ANAHEIM, CA - APRIL 04: Actress Margot Kidder attends day 2 of WonderCon Anaheim 2015 held at Anaheim Convention Center on April 4, 2015 in Anaheim, California. (Photo by Albert L. Ortega/Getty Images)
ANAHEIM, CA - APRIL 04: Actress Margot Kidder, Diane Sherry, Marc McClure, Valerie Perrine and Aaron Smolinski attend day 2 of WonderCon Anaheim 2015 held at Anaheim Convention Center on April 4, 2015 in Anaheim, California. (Photo by Albert L. Ortega/Getty Images)
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McGuane said she found relief knowing that the truth about her mother’s death was finally known to the public. 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 was diagnosed with bipolar disorder and eventually suffered a public nervous breakdown in 1996 after facing several career setbacks in the early 1990s, including a car crash which resulted in her being paralyzed for two years.

Kidder rose to fame as Lois Lane alongside Christopher Reeve in the first “Superman” films. In addition to “Superman,” she also appeared in 1970’s “Quackser Fortune Has a Cousin in the Bronx” opposite Gene Wilder, 1973’s “Sisters,” “The Great Waldo Pepper” with Robert Redford, and 1979’s “The Amityville Horror.”

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