Theresa Marie “Terri” Costello, of Glassboro, NJ, passed away on August 5, 2025, in Voorhees, NJ. Born on October 26, 1964, in Philadelphia, PA, Terri embodied a vibrant, joyful spirit—a spirit that left a lasting impression on everyone lucky enough to know her.
A 1983 graduate of Edgewood Regional High School, Terri was a true self-starter, building her own successful cleaning business over many years. As a single mother of three, her entrepreneurial spirit gave her the flexibility to raise her children with devotion and care. In more recent years, she transitioned into real estate, working first with Exit Homestead Realty in Vineland, and then with Keller Williams, where she brought her signature warmth and determination to every client interaction.
Terri’s zest for life was evident in her many passions. She cherished her garden, her home, and the simple joy of creating beauty and solace for those around her. Her Glassboro home of 34 years was more than a place—it was a sanctuary filled with music, laughter, and light.
She loved spending time with friends, fishing, cooking, traveling, and laughing, but her greatest joy was her family. Terri was endlessly proud of her children, Taylor Willmot, Madison Reader, and Michael “Mickey” Reader, and adored her granddaughter, Nova Ivy Haltiwanger, who brought her immense happiness.
Terri was a devoted Eagles fan, even if she didn’t always know every call. Her love for a cold Blue Moon—always with extra oranges—was well known, as was her affection for her morkie, Toby, who was a constant source of comfort and companionship.
She leaves behind a legacy of love and laughter. Terri is survived by her children and granddaughter; her father Joseph Costello and stepmother Mary “Mitzi”; her sister Dorothy “Dottie” DeMarco (Michael) of Marlboro, NY, and their children, Megan and Michael; and her brother Joey “Bung” Costello (Melinda) of Temecula, CA. She was predeceased by her mother, Dorothy “Dee” (née Slonis) Costello.
Relatives and friends are invited to a viewing on Sunday, August 17, 2025, from 4:00 PM to 6:00 PM at the Barclay Funeral Home, 208 Maple Street, Clayton, NJ 08312. A funeral service will follow at 6:00 PM. A gathering will be held afterward at the Clayton Elks Lodge, 350 S. Broad Street, Clayton, NJ 08312. Interment will be private at the convenience of the family. Sign the guestbook and send condolences at BarclayFuneralHome.net.
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