There’s some sad news to report today. Superman’s Lois Lane and Canadian actress Margot Kidder, passed away at 69. Margot Kidder, best known for her iconic role as Lois Lane, passed away at her home in Montana on Mother’s Day.

She was found in her home at the time of her passing according to a spokesman at Davis Funeral Home in Livingston, MT.

Park County Attorney Bruce Baker told TMZ that an unknown person called police to report that Margot wasn’t conscious and she was not breathing. Police officers were dispatched to the home, but upon their arrival they discovered Kidder had passed away. The cause of death is currently unknown, but there is a police investigation under way. The Livingston Police Chief told TMZ they do not believe foul play is involved.

Margot Kidder played Lois Lane opposite Christopher Reeve’s Superman in Superman. She would reprise her role in Superman II, Superman III, and Superman IV: The Quest for Peace. As Lois Lane she played a sharp news reporter whose interest in the Man of Steel blossoms into romance.

Her most famous role was Lois Lane in the multiple Superman movies. but she was still working as recently as last year on The Neighborhood. She also starred in Smallville in two episodes as Bridgette Crosby.

Despite her success in Superman, Margot Kidder found herself homeless in 1996 due to her public struggles with bipolar disorder.  She had been diagnosed with bipolar disorder eight years before police escorted her to Olive View Medical Center in Los Angeles. However, Kidder had not been taking her medication prescribed to her.  Kidder openly spoke about her problems to People , “It’s very hard to convince a manic person that there is anything wrong with them. You have no desire to sleep. You are full of ideas.” By 2007, she had not had a manic episode and credited orthomolecular medicine.

Margot is survived by her daughter, Maggie McGuane.