- Played the mother of 5 children on Little House on the Prairie (1974), but never had any biological children of her own.
- She was known as the miracle baby in her family because, previous to her birth, her mother had 4 miscarriages.
- When she came to LA in 1973 for a never-completed movie project, she was calling herself "Gabriel Tree", and it was under this name that she beat out 47 other actresses for the role of "Caroline Ingalls" in the long-running TV drama Little House on the Prairie (1974) (co-star Michael Landon convinced her to revert back to her given name of Karen Grassle).
- Won the role of Caroline Ingalls in Little House on the Prairie (1974) out of 47 other actresses who also auditioned.
- After Little House on the Prairie (1974) ended, she was featured as a guest star on various television shows and toured the country performing in numerous plays. Later on, she moved to Louisville, Kentucky, to continue her work in the theater. She was the co-founder and artistic director of Santa Fe's Resource Theatre Company and starred in "Wit" at the Arizona Theater Company.
- Her father, Gene Grassle, ran a gas station and her mother managed a restaurant.
- A long-involved advocate for women's rights, she wrote and co-starred in the mini-movie Battered (1978), which dealt with the issues of domestic violence.
- She now lives in the Bay Area, California, with her adopted son, Zachary. (2005)
- Graduated class valedictorian from Ventura High School in 1959.
- Best known for her role as Caroline Ingalls, Michael Landon's ranch wife on the TV series Little House on the Prairie (1974) for eight seasons.
- When she was told about her audition with Michael Landon for the role of Caroline, Karen stated in an interview that she'd watched Bonanza, but she didn't know which "Cartwright" Michael Landon had played.
- In the late 1960s - hoping to boost her career, briefly changed her professional name to Kay Dillinger, claiming to be the illegitimate offspring of the notorious 1930s bank robber (who died ten years before she was born!).
- Good friend of Michael Landon.
- Graduated from the University of California at Berkeley in 1964
- Inducted (as a cast member of Little House on the Prairie (1974)) into the Hall of Great Western Performers of the National Cowboy and Western Heritage Museum in 1998.
- 2002 - Appeared on the "Memorable TV Moms" version of Weakest Link (2001), along with June Lockhart (Lassie (1954), Lost in Space (1965)), Jo Marie Payton (Family Matters (1989)), Pat Crowley (Please Don't Eat the Daisies (1965)), Janet Hubert (The Fresh Prince of Bel-Air (1990)), Alley Mills (The Wonder Years (1988)), Carol Potter (Beverly Hills, 90210 (1990)) and Beverly Garland (My Three Sons (1960)). Potter won.
- Mother, with ex-husband James Allen Radford, of adopted son Zachary Radford.
- Trained at the London Academy of Music and Dramatic Art.
- Her first New York break was the play "The Gingham Tree." She had to borrow a dollar from a friend to go to the audition!
- Appearing in a commercial for "Premier" bathrooms. (January 2009)
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