Theresa L. nee Castrulli, Duncan, 77, of Collinsville, Ill., born May 29, 1948, in Brooklyn, NY., passed away at 1:10 p.m. Friday, September 12, 2025, at Anderson Hospital, Maryville, Ill.

Theresa was a loving mother, grandmother and great grandmother.

She was preceded in death by her loving husband Cecil W. Duncan Sr., and her parents, William Victor and Mary, nee Sepe, Castrulli.

Surviving are her loving children, Donna (Sam) Conder, Wayne (Susan) Duncan, Jeannine (Justin Smith) Duncan, Victor (Tiffany) Duncan and Joseph (Lauren) Duncan; eight grandchildren, Christopher (Scout) Mitchell, Megan (Dylan) Thompson, Corey (Theresa) Mitchell, Matthew, Tavey, Ellise, Avery and Noah Duncan; six great grandchildren, Andrew, Colt, Savina, Aracelli and Fallon Mitchell and Dakota Thompson; two sisters, Barbara Sanchez and Maria Cigna and numerous other family members.

No visitation and services are planned at this time.

The family is being served by HERR Funeral Home, 501 West Main Street, Collinsville, Illinois  62234