Superman star Margot Kidder, who played Lois Lane, dies aged 69

The actress and activist passed away at her home on Sunday

Margot Kidder who played Lois Lane in the Superman films has died aged 69.

Colin Zeman, director of Franzen-Davis Funeral Home in Livingston, Montana confirmed to The Independent that she passed away.

He would not disclose the cause of death, but Kidder died at her home in Livingston, Montana.

(Credit: Alberto E. Rodriguez/Getty Images (Credit: Alberto E. Rodriguez/Getty Images)

Born in Canada, Kidder began acting in the 1960s; however she didn't get her big break until the 1973 movie Sisters.

She would go onto star in four Superman films opposite Christopher Reeve throughout her career and starred in The Amityville Horror, Black Christmas and Heartaches

Kidder had a close friendship with Reeve from 1978 until his death in 2004.

"When you're strapped to someone hanging from the ceiling for months and months, you get pretty darned close," Kidder told CBS. "He was such a huge part of my life... He was complicated, very smart, really smart, and he knew he'd done something meaningful. He was very aware of that and very happy with that role."

In 1996, Kidder dealt with her own health issues: she was diagnosed with bipolar disorder following a public manic episode.where she lost three years' worth of work from an autobiography she was writing.

The actress was reported missing after several days and was taken to Olive View-UCLA Medical Center.

Her career struggled following the nervous breakdown, but by the 2000s, she landed guest-starring roles on Smallville, The L Word and Brothers & Sisters.

In 2015, she book home an Emmy Award for her role on the children's TV series R.L. Stine's The Haunting Hour.

Kidder also starred on Broadway, most recognizable in a 2002 production of The Vagina Monologues.

The actress was also known for her political, environmental and anti-war activism.

Kidder wed three times and is survived by her daughter, Maggie McGuane.

Funeral arrangements for Kidder are being made care of Franzen-Davis Funeral Home, though details about services have not yet been revealed publicly.