Terrence Michael Cassidy, 87, of Brookhaven, passed away at home on April 7, 2026. Born and raised in Philadelphia to the late Jerome and Anna (née Weiss) Cassidy, Terrence was a proud graduate of West Catholic High School.
A veteran of the U.S. Navy, Terrence served as an electrical engineer during the Vietnam Era. His service took him across the globe—from Antarctica to Greenland—where he was instrumental in developing early missile defense and communication systems. Following his active duty and continued service in the Naval Reserves, he enjoyed a distinguished career with Lockheed Martin, dedicated to building radar defense systems for U.S. Naval warships until his retirement.
While serving in the Navy, Terrence met his beloved wife, Jung. In 1979, they settled in Brookhaven, PA, to raise their three daughters. A man of deep faith, Terrence was a longtime member and deacon of Trinity Christian Church of Greater Philadelphia.
Terrence was a lifelong learner and an avid reader with a passion for movies. He was also a dedicated sports fan, cheering on the Flyers, Phillies, the NFL, and English Premier League soccer.
He is survived by his devoted wife, Jung; his three daughters, Teresa (Paul) Vo, Maureen Cassidy, and Rose (Gerald) McClintock, seven grandchildren; and a community of friends and family who will miss him very much.
Family and friends are invited to his viewing on Thursday, April 16, 2026, from 10:00 AM to 11:00 AM at the Danjolell-Stigale Memorial Home (3260 Concord Road, Aston). A funeral service with military honors will follow at 11:00 AM. Interment will be private.
In lieu of flowers, memorial donations in Terrence’s name may be made to forgottencats.org. Online condolences may be shared at Danjolell.com.
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