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Aug. 16, 1927 – Dec. 10, 2013

Sister Margaret Mary Gleason, a teacher and school principal, died Tuesday in the Mercy Health Care Unit of the Sisters of Mercy in Buffalo. She was 86.

Also known as Sister Miriam Xavier, she was a Sister of Mercy for more than 67 years.

Born in Niagara Falls, the daughter of Irish immigrants and the youngest of seven children, she attended Sacred Heart Elementary School and St. Mary of the Cataract High School.

She received a bachelor’s degree in history from St. Bonaventure University and a master’s in social studies from Niagara University, then earned a master’s in pastoral ministry from St. Joseph College, West Hartford, Conn.

She first taught elementary grades, then junior high school. She also served as principal of Immaculate Conception School in Wellsville, St. Bonaventure School in West Seneca, Sacred Heart School in Orchard Park and St. Mary’s School in Niagara Falls.

A Mass of Christian Burial will be offered at 4 p.m. Sunday in the Mercy Center, 625 Abbott Road.