Frances M. Testani Osterberg, age 89 of Trumbull passed away Saturday, June 15, 2024 at St. Vincent's Medical Center. She was the beloved wife of the late John T. "Gus" Osterberg. Born in Bridgeport, she was the daughter of the late Rocco and Mildred Pillow Testani. Survivors include her loving children, daughters, Karen Gehrke and her husband Jack of Madison, Lisa Sanzo and her husband Tony of Monroe, son John Osterberg and his wife Tracey of Trumbull, grandchildren, Christopher (Shannon), Jessica (Ryan Nager), Jason (Monica), Michael, Tyler (Brooke), Olivia, and Erik, great grandchildren, Gianna, Jaxson, Mason and Taylor, and her nieces and nephews. She was predeceased by her brothers, Joseph and Rocco Testani.  Her favorite times were holidays with family and vacations in Cape Cod and Marco Island.  Frances' family would like to thank her caregivers, Veronica Depina and Manda Sann for their many years of love and support. Funeral services will be held Wednesday at 11:00am meeting directly at St. Theresa Church, 5301 Main Street, Trumbull with a Mass of Christian Burial. Interment will follow in Long Hill Burial Grounds, Trumbull. To send online condolences please visit www.redgatehennessy.com