Donald E. Duncan, entered into his eternal rest on on Mon. Dec. 6, 2021. Beloved husband of the late Nancy D. Duncan. Loving father of Robert L. Duncan, Suzanne M. (Paul) Waeltermann, Donald R. and Matthew P. Duncan. Cherished grandfather of Teresa and Chris Waeltermann, Our dear father-in-law, brother, brother-in-law, uncle, great-uncle, cousin, friend and comrade to many at Fenton American Legion Post #400. Visitation on Tuesday, December 14, 2021 at Jay B. Smith Funeral Home, 777 Oakwood Dr., Fenton, MO from 4-8:00pm. American Legion service on Wednesday at 10:00am. Interment with honors to follow at Jefferson Barracks National Cemetery.