Best remembered as Judy Robinson on the popular 1960s series Lost in Space, she also appeared in episodes of Alfred Hitchcock Presents and My Three Sons.
Early in her career, she appeared in the 1965 film Beach Blanket Bingo.
She lent her voice to an animated short film titled "The Bolt Who Screwed Christmas."
Born Birgit Rusanen in Norway to a German father and a Finnish mother, she was adopted at the age of four by an American family. She was married to Oswald Gooden from 1963 until 1974; her second marriage, to Kevin Kane, began in the mid 1970s.
She and Bill Mumy were both series regulars on Lost in Space.