Best-known for playing Lew Ayres' fiancee in several Dr. Kildare movies in the 1940s, Day worked with Cary Grant, Robert Mitchum, Lana Turner, John Wayne, Spencer Tracy, Joel McCrea and Kirk Douglas in a film career that began in the 1930s and lasted until 1960.
An avid baseball fan, Day also amassed small-screen credits on "Playhouse 90," "Alfred Hitchcock Presents," "Wagon Train," "Let Freedom Ring," "FBI," "Sixth Sense," "Murder, She Wrote," "Fantasy Island," "Love Boat" and "Lou Grant."
The actress also starred in "The Laraine Day Show" and was a panelist on "I've Got a Secret."
Day had moved to Utah in March after the death of her husband of 47 years, producer Michel M. Grilikhes. She had been married and divorced twice before she wed Grilikhes in 1961.
Day is survived by two daughters with Grilikhes -- Gigi Bell and Dana Grilikhes Nassi; a son, Christopher, and daughter, Michelle, with Leo Durocher; numerous grandchildren; and a twin brother, Lamar Johnson.
Services and burial will be private. A public memorial is being planned.