Jack Douglas Duncan
May 21, 1934 - August 14, 2025

Jack, 91 years of Vacaville, passed away of natural causes the morning of August 14, 2025. Born in Denver, Colorado, his parents settled in the East Bay before to WWII. Jack and Beverly married in 1951. They spent 72 loving years together. The family moved to Vacaville in 1975.

Jack owned and operated a Standard Oil Station in the East Bay. He later worked as a manager for an independent auto parts store. Jack was a loving and devoted husband, father, grandfather and great grandfather. After retirement, he enjoyed a quiet life with his wife and extended family.

Jack was preceded in death by his wife Beverly, son Doug Duncan and daughter Cheri Mulliner. He is survived by son and daughter-in-law Gary and Petra Duncan, granddaughter and son-in-law, Stacie and Wiley Carder; grandson and daughter-in-law, Phil and Carolyn Mulliner; and two great granddaughters.

A service will be held at 10:00 A.M. Friday, August 22, 2025 at Vaca Hills Chapel.