Fischer, Douglas C. – on July 6, 2025, age 71, of Locust Valley, NY. Beloved husband of Mary for 41 years. Loving father Taylor Fischer-Allen (Zachary) and Bradley. Devoted grandfather of Aidan and Luca. Dear brother of Barbara Monti (Thomas) and Susan Witt (Arthur). Cherished brother in law of Noreen Fallon-Sydor (John), Patti Quartuccio (Paul) and Geri Pivowar (Robert). Also survived by many loving nieces, nephews, relatives and friends. Memorial Visitation Oyster Bay Funeral Home, 261 South St., Oyster Bay, NY, Saturday, July 19th from 10-11 a.m. Inurnment to follow at Locust Valley Cemetery.