William Thurston Lady, 85, an obstetrician-gynecologist who had a private practice in Arlington County for more than 20 years before retiring in 1980, died Nov. 28 at a hospital in Sun City Center, Fla., after a heart attack.

Dr. Lady was a former chief of gynecology at Northern Virginia Doctors Hospital, a founding member of the Washington Metropolitan Colposcopy Society, a life member of the Washington Gynecological Society and a founding member of the George Washington University Obstetric and Gynecological Society.

Dr. Lady, a resident of Sun City Center since the early 1990s, was born in Victor, Colo., and raised in Washington. He graduated from Eastern High School and received a medical degree from George Washington University in 1938.

He interned and served residencies in obstetrics and gynecology at George Washington University before entering the Army during World War II and serving as a medical officer in England. After the war, he worked about 10 years in a private practice in Washington.

Survivors include his wife of 61 years, Francis M. Lady of Sun City Center; four daughters, Shirley Steele of Arlington, Patty Mathews of Leesburg, Carol Thompson of Newberry, S.C., and Diane Liebeck of North Plainfield, N.J.; seven grandchildren; and five great-grandchildren.