By Lindsey Kupfer from The New York Post.

“Superman” actress Margot Kidder has passed away at age 69.

The actress, who played Lois Lane alongside Christopher Reeve in 1978’s “Superman,” passed away at home on Sunday, according to the Franzen-Davis funeral home in Livingston, Montana.

According to TMZ, who first reported the news, the cause of death is unknown at this point.

The funeral arrangements are still pending.

Kidder was a Canadian actress who began acting in 1968 and got her big break on the 1973 film “Sisters.” She appeared as Lois Lane in four “Superman” movies over the years and had most recently appeared in the movies “The Neighborhood” and “The Red Maple Leaf.”

“The reality of my life has been grand and wonderful, punctuated by these odd blips and burps of madness,” Kidder told People shortly after her breakdown.

The actress was married three times and is survived by her daughter, Maggie McGuane.

A rep for the actress did not immediately return our request for comment.

In 2015, Kidder took home a Daytime Emmy for playing Mrs. Worthington in “R.L. Stine’s The Haunting Hour.” She also guest starred in the teen Superman drama “Smallville.”

Kidder struggled with bipolar disorder. In 1996, she went missing and was found several days later hiding in bushes near a Los Angeles home. Kidder was taken to a hospital for observation. She had since become a mental heath advocate.

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