Sister of St. Casimir Margaret Mary Mazgelis, 94, died Aug. 5.

Born in Massachusetts, she completed her high school education at St. Casimir Academy in Chicago and entered the Sisters of St. Casimir in 1944. She made her first profession of vows in 1946 and made her final vows in 1951. 

Sister Margaret Mary ministered in elementary schools in Illinois, Indiana and Pennsylvania. In the Archdiocese of Chicago, she taught at Providence of God (1946-1950), St. Anthony, Cicero (1954), St. George (Bridgeport, 1954-1957), Nativity BVM (1957-1960) and Maria High School (1960-1983). She served as principal of Nativity BVM (1983-1996).

She served as congregational general secretary and then administrative assistant from 1996 to 2013. Most recently, Sister Margaret Mary participated in the ministry of prayer and presence at Franciscan Village in Lemont.