Cover photo for Sister Mary Ellen Theriault's Obituary
Sister Mary Ellen Theriault Profile Photo

Sister Mary Ellen Theriault

April 14, 1948 — November 17, 2022

Sister Mary Ellen Theriault, 74, passed away peacefully on Thursday, November 17, 2022. Sister Mary Ellen was born on April 14, 1948 in Waterbury CT, a daughter of the late Ernest and Julia (Graham) Theriault. She earned her B.A. in Education from Saint John’s University and her Masters Degree in Theology from Saint Michaels College in Vermont. She entered into religious life on September 11, 1966 with the Ursuline Sisters of Tildonk in Blue Point, Long Island, New York.
She was a teacher at The Nativity in Ozone Park, NY, Saint Maurice in Stamford, CT, and Saint Thomas the Apostle in West Hartford, CT. Mary Ellen relocated to Highgate Center, Vermont where she was Director of Religious Education at Saint Lewis Parish for 25 years. She moved to Weston Vermont where she was very active at the Weston Priory. Most recently Mary Ellen served on the leadership team for the Ursuline Sisters. Mary loved children and had many babysitting assignments for family and friends.
She leaves a sister Julia (Judy) Koskelowski, brothers Norbert and his wife Angela, John and his wife Veronica, and a sister-in-law Louise Theriault. She was pre-deceased by her brother Ernest. Mary is also survived by many nieces and nephews, great nieces and nephews, cousins, and all of her religious sisters.
Mary was also pre-deceased by a very special sister and lifelong friend, Sister Joan Sirtowt.
To all of Mary’s friends near and far, she loved you all.
A mass of Christian burial will be celebrated 11A.M. Wednesday, November 30, at Saint Peter and Paul / Mary Mother of the Church, 56 Southmayd Rd, Waterbury CT. Burial will follow at Calvary Cemetery. Relatives and friends may visit from 9:30 A.M. until 10:45 A.M. at Casey’s Eastside Memorial, 1987 East Main St, Waterbury CT.
Memorial contributions may be made in memory of Sister Mary Ellen to the Ursuline Sisters of Tildonk, 8115 Utopia Parkway, Jamaica NY 11432.
To order memorial trees or send flowers to the family in memory of Sister Mary Ellen Theriault, please visit our flower store.

Service Schedule

Past Services


Wednesday, November 30, 2022

9:30 - 10:45 am (Eastern time)

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Casey's Eastside Memorial Funeral Home & Cremation Care

1987 East Main Street
Waterbury, CT 06705

*Standard text messaging rates apply.

Funeral Service

Wednesday, November 30, 2022

Starts at 11:00 am (Eastern time)

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Saints Peter & Paul Church

56 Southmayd Road
Waterbury, CT 06705

*Standard text messaging rates apply.


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