Mariclare Costello, best known to audiences for her role as teacher Rosemary Hunter on The Waltons, has passed away at the age of 90. According to an obituary published in the Peoria Journal Star, she died on the morning of April 17 in Brooklyn, New York. Her family described her as someone with a rare gift for helping others discover their own creativity and confidence, leaving a lasting impact both on and off the screen.

For many viewers, Costello will always be remembered as part of the heart of The Waltons, a series celebrated for its warmth, strong values, and meaningful storytelling. Her portrayal of Miss Hunter, the local schoolteacher, made her a memorable presence during the show’s early seasons. Though her role was not the largest, it carried a quiet strength that resonated with audiences and contributed to the sense of community that defined Walton’s Mountain.

Born in Peoria, Illinois, Costello grew up in a supportive, creative environment that encouraged her interest in the arts. She pursued theater and education, earning a master’s degree in drama before building a respected career on stage. Her work eventually brought her to New York and Broadway, and she later transitioned into film and television in the late 1960s. Over the years, she appeared in a variety of productions, including Ordinary People and Let’s Scare Jessica to Death, as well as guest roles on well-known television series.

Outside of acting, Costello was remembered for her kindness, curiosity, and vibrant personality. She enjoyed cooking, caring for animals, and connecting with people from all walks of life. She was married to actor Allan Arbus from 1977 until his passing in 2013. Costello is survived by her family, who remember her as warm, thoughtful, and full of life.