Sister Kathryn A. LaCasse, 87, died peacefully on July 4, 2025 in Windham, New Hampshire after a long illness.  Sister Kathryn, formally known as Sister Cassion, was a Sister of Mercy for 65.  Her parents, Edward and Marion LaCasse, and her only sibling, Rita were predeceased.

Kathryn was born in Wilton, New Hampshire.  She had a Bachelor of Education degree from Keene State College and a Special Education certificate from St. Joseph College, West Hartford, Connecticut and Keene State College.

Sister Kathryn was an elementary and junior high school science teacher and a member of the Mercy Education Network.

She taught in Pelham, Laconia, Portsmouth and Jaffrey.  She also worked Volunteering at Camp Joy and Camp Bernadette.  In her younger days, she took dancing lessons and enjoyed synchronized swimming.  She also enjoyed classical music and ballet.

Sister Kathryn was a visitor to cancer patients.  As a cancer survivor, she brought hope and support to these patients.

Friends may call at the Warde Senior Living, 21 Searles Road, Windham, New Hampshire on Friday, July 11, 2025. from 10:00-11:00 a.m.  A Mass of Christian Burial will be celebrated at 11:00 a.m. in the chapel. Burial will be at St. Joseph Cemetery, Bedford, New Hampshire. Memorial donations may be made to the Sisters of Mercy – Northeast, 15 Highland View Road, Cumberland, RI 02864-1124, and online at www.sistersofmercy.org. Arrangements are under the care of the Carrier Family Funeral Home, 38 Range Road, Windham, NH 03087.