
Peoria, Illinois, USA
Mariclare Catherine Costello (February 3, 1936 – April 17, 2026) was an American actress. She was a lifetime member of The Actors Studio. Costello's most notable role was that of Rosemary Hunter Fordwick on the television series The Waltons, from 1972 to 1977. In 1977, after her role on The Waltons, she played matriarch Maggie Fitzpatrick on the short-lived drama show The Fitzpatricks.

as Mrs. Rosemary Fordwick

as Cassie Latham Burns
1984

as Mother Mary Catherine
1994

as Mrs. Rosemary Fordwick
1972

as Kay Wallace
1977

as Anita Boyer
1979

as Louise Larsen
1977

as Diane Gordon
1973

as David's Mother
1993

as Audrey
1980

as Senator Cunningham
1984

as Maggie Fitzpatrick
1977

as Gabrielle Krieger
1976
as Susan Finn
1990

as Kathy Patterson
2000

as David's Mother
1993

as Susan Finn
1990

as Rose
1990

as Mary Alice Duncan
1987

as Ellen Mancini
1985

as Jane Bladow
1984

as Senator Cunningham
1984

as Adele Cooney (segment "The Bishop of Battle")
1983

as Barbara Thompson
1982

as Emma Spencer
1981

as Audrey
1980

as Winnie Naponic
1980

as Louise Carpenter
1980

as Pat Morris
1977

as Gabrielle Krieger
1976

as Julia Baker
1976

as Mrs. Warnall
1975

as Louise
1974

as Beryl Strauss
1974

as Antoinette Slovik
1974

as Herself - Narrator
1972

as Emily
1971

as Honky Killer's Wife
1970
as Mrs. Rosemary Fordwick
4 ep.

as Cassie Latham Burns
1 episodes

as Mother Mary Catherine
1 episodes

as Mrs. Rosemary Fordwick
4 episodes

as Kay Wallace
1 episodes

as Anita Boyer
1 episodes

as Louise Larsen
1 episodes

as Diane Gordon
1 episodes

as Maggie Fitzpatrick
13 episodes