Sister Theresa Kilcommons, O.P., a member of the Sisters of St. Dominic, Amityville, L.I., for 71 years, died June 11. She was 89.

Raised in Lynbrook, L.I., she attended St. Raymond Elementary School in East Rockaway, and Bishop McDonnell H.S., Crown Heights, where she met the Sisters of St. Dominic.

She entered the novitiate on Sept. 8, 1946. On Aug. 4, 1947, she received her habit and religious name, Sister Kilian. She pronounced her vows on Aug. 7, 1948.

She earned her bachelor’s degree at Molloy College, Rockville Centre, and her master’s degree at St. John’s University.

Her ministry in elementary education spanned nearly three decades, beginning with her first assignment at Sacred Heart, East Glendale, in 1948.

She went on to teach elementary grades at Holy Redeemer, Freeport; Curé of Ars, Merrick; St. Martin, Amityville; St. Ignatius, Hicksville; Our Lady of Perpetual Help, Lindenhurst; St. Agnes, Rockville Centre, and Incarnation, Queens Village.

She served as director of religious education at Our Lady of Perpetual Help, Lindenhurst, 1976-84.

After a year at Our Lady Queen of Martyrs, Centerport, she returned to teaching on the secondary level at Queen of the Rosary Academy, Amityville, and then Sacred Heart Academy, Hempstead.

In 1988, she moved to St. Anthony, Oceanside, and served as development director at Dominican Commercial H.S., Jamaica. She joined the community at St. Martin, Amityville, and became development director at the parish school.

After a sabbatical at Siena Spirituality Center, Water Mill, she served as a residence aide at Bishop Ryan Residence, Copiague, and as a clerical worker at the Amityville Motherhouse, and then at St. Aloysius School, Ridgewood.

She retired in 2003, and moved to Carlin Hall at Queen of the Rosary Motherhouse in 2016.

A Mass of Christian Burial was celebrated in St. Albert Chapel, Amityville. Burial followed in the Sisters’ cemetery.