Actress Margot Kidder has died

Canadian born ``Superman'' actress Margot Kidder has died at age 69, a Montana funeral home confirms.

Best known for playing Lois Lane opposite Christopher Reeve in the ``Superman'' films of the 1970s and 1980s, she went on to become an advocate for mental health issues after speaking out about living with bipolar disorder.

She also became a political activist in recent years and was among a group of environmentalists to be arrested outside the White House in 2011 during a protest against TransCanada's Keystone XL pipeline.

Kidder, who became an American citizen, had settled in Montana to live in a ``culture-free zone'' away from the spotlight and close to her daughter and grandchildren.