Cause of death for popular actress from the 80's revealed

The activist and actor Margot Kidder was most famously known as Lios Lane in the original "Superman" series alongside Christopher Reeve. 

Kidder passed away on May 13 at her home in Livingston Montana. Kidder would have celebrated her 70th birthday in October. 

As reported by BBC, her death was ruled as a suicide, and a coroner confirmed that she died of "self-inflicted drug and alcohol overdose."

Read more about her life and career on our Twitter account @amomama_usa. 

Back in 1996, Kidder disappeared for a few days after experiencing paranoia and was later found in a stranger's backyard. 

She was admitted to the Olive View Medical Center and was diagnosed with bipolar disorder. Kidder later explained that her "mood swings could knock over a building. 

The acclaimed actress began her career in the late sixties when she landed a role in "The Best Damn Fiddler From Calabogie to Kaladar."

During the first few years in the industry, she also appeared in "Wojeck," "The Dick Cavett Show," and "Banacek." 

Kidder soared to fame when she was cast as Lios Lane in "Superman: The Movie" in 1978. She was awarded the Saturn Award for Best Award later that year. 

Her last film appearances were as Maggie in "The Neighborhood" in 2017 and as Dr. Amanda Walker in "The Red Maple Leaf" the year before. 

Her fans and followers took to social media with Sarah Douglas tweeting: "We continued to have fun together over the last 40 years and she was a joy to be around."

David Axelrod said that Kidder "should be remembered as much for courageously, candidly discussing her battles with mental illness as for any screen role."

Teri Hatcher, who also portrayed Lois Lane later on, said: "It is a privilege to have shared the same role of Lois Lane with this wonderful actress." She added: 

She led the way brilliantly.

Kidder, who was married three times, is survived by her daughter Maggie and two grandchildren. 

The National Suicide Prevention Lifeline is 1-800-273-8255. Other international suicide helplines can be found at befrienders.org.