Formerly known as Sister William Margaret, she spent 35 years of her religious life ministering in the Brooklyn and Rockville Centre dioceses.
She taught fifth and sixth grades at Our Lady of the Cenacle, Richmond Hill, 1956-60, and taught at Bishop Reilly H.S., Fresh Meadows, 1965-70.
She also ministered in Halifax, Bermuda and Massachusetts as a director of spiritual development and retreat director.
In 2010, she retired to the Mount St. Vincent Motherhouse due to declining health.
She is survived by her brothers, John C. Swan of Lowell, Mass., and William J. Swan of Appleton, Wisc.