Katherine "Kay" E. Cassell (Dwyer) - of Medford, passed away surrounded by her loving family on January 24, 2026. She was the cherished wife of the late Thomas S. Cassell, with whom she shared over 50 years of marriage. Kay was a devoted mother to James A. Cassell and his wife Carolyn of Florida, Kathleen M. Cassell of Reading, Patricia E. Lee and her husband Gerald of Reading, and Joanne A. Cassell and her late husband Danny Pereira of Somerville. She was also a loving grandmother to Thomas and Brenna Cassell, Kerry Capalino, Jack Lee and his partner Rosalie Parr, Katherine Lee, David Pereira, and Julie Pereira-Raeke and her husband Patrick Raeke. Her legacy continues with her great-grandchildren, Kiara and Anthony Capalino.

Kay was predeceased by her siblings, Thomas E. Dwyer Somerville F.D., John T. "Jack" Dwyer Lt. Det. Mass State Police and his late wife Theresa, Richard J. Dwyer ATF, Bernard J. Dwyer Assistant DA Suffolk County and his wife Rosemary. She is also survived by many nieces and nephews.

Kay dedicated her career as an administrative assistant for the Metropolitan District Commission Police Department (MDC). She found joy in spending time with her family, enjoying cruises, the beach, her swimming pool, and cheering for all the Boston sports teams.

Visiting hours will be held at the George Doherty Funeral Home, 855 Broadway (Powder House Sq.) Somerville, on Saturday morning, January 31, 2026, from 9:30 to 10:30, followed by her Funeral Mass at St. Raphael Church, Medford at 11:00. Interment will take place at Holy Cross Cemetery, Malden.

In lieu of flowers donations in Kay's name can be made to St. Jude Children's Hospital at www.stjude.org