Sister Mary Margaret Duffy, O.P., a Sister of St. Dominic, Amityville, L.I., for 86 years, died Aug. 26. She was 102.

Born in Maspeth, she entered the Congregation from Our Lady of the Miraculous Medal parish, Ridgewood, on Jan. 1, 1929. Later that year, she received the habit and her religious name Sister Mary Arthur.

She earned her bachelor’s and master’s degrees in English from St. John’s University.

From 1930 to 1943, she taught at All Saints Elementary School, Williamsburg, and St. Elizabeth School, Ozone Park. She then taught English on the secondary level at Dominican Commercial H.S., Jamaica, 1942-65.

In 1963 the Congregation asked her to join the faculty of the Catholic University of Puerto Rico, where she ministered in the English Department until 1969.

She also taught in the English Department of Molloy College, Rockville Centre, L.I., 1969-79.

She taught at St. Boniface School, 1979-80, and then served as coordinator of Villa Maria Convent in Watermill, L.I., a place of retirement for several elderly Sisters, 1980-85.

In 1985, she moved to Queen of the Rosary Motherhouse, Amityville.

A Mass of Christian Burial was celebrated at Queen of the Rosary Motherhouse on Sept. 1. Interment in the Sisters’ cemetery followed.