Source: 24/7 News
(Los Angeles, CA) -- The actress who played Lois Lane in the original "Superman" movie has died at the age of 69.
TMZ reports Margot Kidder died on Sunday in Montana, but the cause is not known.
Kidder co-starred with the late Christopher Reeve in the 1978 superhero film and its three sequels.
She also had a stint on Broadway and guest roles on TV shows "Smallville" and "Brothers and Sisters."
Kidder was public about her struggle with bipolar disorder, and served as an advocate for mental health.