Dennis Schaff was born June 8, 1947 in Mandan, ND to Peter and Rose Schaff. He grew up at Mandan and attended Mandan High School. On February 1, 1967 he joined the US Marine Corp, serving during the Vietnam War and was honorably discharged October 8, 1972. He was a resident of the Lake Andes Health Care Center since July 2008.
He is survived by three sisters: Geraldine (Oscar) Jochim and Pauline Enyart, Mandan; Sharon (William) Richords, Denver; two brothers: Kenneth (Cathy) Schaff, Mandan and John (Beverly) Schaff, Denver.
He was preceded in death by two brothers: Clarence and Donald and one sister, Leona Fowler and his parents.