Yvonne A. Mahoney, 91, who taught kindergarten for 20 years at St. Francis de Sales Catholic Church’s school in Washington, died July 21 at her home in St. Leonard. She had congestive heart failure.

Mrs. Mahoney taught at the school from 1959 to 1979. She belonged to St. Francis de Sales parish, where she sang in the choir and volunteered as the church sacristan. She was a member of the Legion of Mary.

Yvonne Agnes Gonthier was born in Laconia, N.H., and was the oldest of seven children. She was raised in Amesbury, Mass., and came to Washington during World War II for an administrative job with the War Department. She later worked at the Pentagon.

In 1985, Mrs. Mahoney and her husband moved to Bowie, where she was a member of St. Pius X and Sacred Heart churches. In 2009, she moved to St. Leonard to live closer to her daughter.

Her husband of 43 years, James Mahoney, died in 1989.

Survivors include three children, James Mahoney Jr. of Columbia, Frances Mattos of Bowie and Mary Margaret McKeon of St. Leonard; three sisters; six grandchildren; and three great-grandchildren.