Mariclare Costello, the actress best known to many viewers for her memorable role on The Waltons, has died at age 90.
Costello passed away on April 17 in Brooklyn, according to an obituary shared by her family. Over a decades-long career in film, television and theater, she built a respected résumé that ranged from classic family dramas to cult horror favorites.
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Mariclare Costello’s Iconic Role on The Waltons
For fans of The Waltons, Costello was known as schoolteacher Rosemary Hunter, a recurring character who appeared in 15 episodes during the show’s first five seasons from 1972 to 1977. Her character became an important part of Walton’s Mountain and famously married Rev. Matthew Fordwick, played by John Ritter, during the fourth-season premiere.
Looking back on her time with the series, Costello said in a 2011 interview with Terror Trap, “I had the greatest time with Richard Thomas and John Ritter. We laughed from the beginning of the day until the end of the day. We spent a lot of time together. They were great.”
Costello’s Career: From Horror Cult Classics to Ordinary People
Before and after her time on the beloved CBS drama, Costello worked steadily across Hollywood. She appeared in the cult horror film Let’s Scare Jessica to Death as Emily Bishop, a haunting vampire figure that became one of her most remembered screen performances.
Her additional credits included Ordinary People, The Adventures of Buckaroo Banzai Across the 8th Dimension, and television appearances on Murder, She Wrote, Chicago Hope, Judging Amy, and more.
Mariclare Costello’s Personal Life and Marriage to Allan Arbus
Costello was also a longtime member of The Actors Studio and appeared on Broadway four times. She was married to Allan Arbus, known for playing Maj. Sidney Freedman on M*A*S*H, and welcomed one daughter together. They were married up until his death in 2013.

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