Sr. Mary Elizabeth Cassidy, (aka Sr. Regina Marie) the third child of Mary Quinn and James Cassidy, was born in Wilmington, DE, on January 22, 1927. She attended and graduated from St. Paul's Elementary School and St. Elizabeth's High School (the third graduating class). After graduation, she assisted her father at the Monaghan Shoe Store before entering the Benedictine Sisters of Ridgely, MD, in 1954.

Sister graduated from The Benedictine College, Atchison, KS, with a BA and also earned an MA from LaSalle University of Philadelphia, PA. Her ministries included many years as a primary grade teacher in parochial schools of both Wilmington, DE and Newark, NJ. After her retirement from teaching, she was team member for the Religious Education Department of the Eastern Shore of Maryland. Later, she ministered as co-directress of St. Benedict's retreat Center in Hockessin, DE.

Sr. Mary Elizabeth was always an active community member serving on several committees throughout the years. She also ministered as a local superior, formation directress and sub-prioress.

Sister was very well-known for her warm and welcoming Irish personality. She is predeceased by her parents, her brothers, Rev. James, OSFS and John, her sisters, Ann Flanigan, Jeanne Looby, her nephew, Shaun, her niece, Cindy, and grandnephew, Zach. She is survived by her Benedictine sisters and many nieces and nephews.

Visitation will be held at Holy Family Church, 15 Gender Road, Newark, DE on Wednesday, June 18, 2025 from 10:00AM to 11:30AM with the Mass of the Resurrection following at 11:30AM.

Interment will be held the next morning in St. Gertrude Cemetery, Ridgely, MD. In lieu of flowers, donations may be made to the Benedictine Sisters, 25 Gender Road, Newark, DE 19713.