Born in Bridgeport, Connecticut, Betty McGuire cultivated a rich and varied career that saw her share the stage and screen with some of the industry's most iconic figures. Her journey began on Broadway, where she made her debut in the 1955 musical Plain and Fancy as Rebecca. She continued to grace the Great White Way in productions like Happy Hunting (1956) and Oh Captain! (1958), collaborating with luminaries such as Ethel Merman, Barbara Cook, Bea Arthur, and Tony Randall. Beyond New York, McGuire also toured extensively in popular productions including Auntie Mame, Gypsy, and Oliver!.

McGuire seamlessly transitioned to the screen, making her television debut in a 1973 episode of The Doris Day Show. Her small-screen credits quickly grew to include an impressive list of iconic series from across multiple decades. Fans might remember her from guest appearances on classics like Columbo, Charlie’s Angels, Hart to Hart, Little House on the Prairie, Moonlighting, Matlock, MacGyver, and later, Star Trek: Deep Space Nine, Murphy Brown, CSI: Miami, ER, and 7th Heaven. However, it was her endearing portrayal of Kate Malone, the grandmother on ABC's hit sitcom Growing Pains, that cemented her place in the hearts of a generation of television viewers.

While her television work was extensive, McGuire also left her mark on film. Her movie roles included appearances in the Cheech & Chong comedy Up in Smoke (1978), Hometown USA (1980), The Incredible Shrinking Woman (1981), and the horror film Wishmaster (1997).

Beyond her acting endeavors, McGuire was a dedicated volunteer, spending years supporting the Coalition for Economic Survival legal clinic in Los Angeles. There, she offered invaluable assistance to low-income tenants facing eviction. In her later years, she also hosted "GabFest," a segment on NBC Nightly News with Lester Holt, where she spotlighted the lives and stories of her fellow residents at The Motion Picture & Television Fund Home, showcasing her enduring connection to her community and colleagues in the industry. Her passing, reported by Deadline, marks the end of a century-long life lived with dedication to both her craft and her community.