Margot Kidder, the actress who played Lois Lane in "Superman," died Sunday in Montana ... TMZ has learned.
Margot was at her home when she passed away, according to the spokesperson at Franzen-Davis Funeral Home in Livingston, MT.
Bruce Becker, the Park County Attorney, tells TMZ ... an unknown person called police to report Margot was unconscious and not breathing.
The Livingston Police Chief says foul play is not considered a factor, but her death is now under investigation.
She continued acting right up until this year, taking small roles in TV shows and movies -- but also had stage roles ... including "The Vagina Monologues" on Broadway.
To read full article - http://v.duta.us/tpb6LAAA