Deborah Sue Koss, age 70, of Gravois Mills, Missouri, passed away Thursday, June 3, 2021 at her home. She was born March 7, 1951, in Topeka, Kansas, a daughter of Delmar James and Esther (Tostado) Sandeffer. Survivors include her husband Chuck Koss; a son, Brian Koss and wife Teresa; two grandchildren, Brittany Koss and Shaun Durham and Blake Koss; and four great-grandchildren, Mailey Koss, Beau Koss, Memphis Durham and Lincoln Durham. A celebration of life will be held 2 p.m., Saturday, June 12, 2021, at Kidwell-Garber Laurie/Sunrise Beach Chapel. Visitation will be from 1-2 p.m., Saturday at the funeral home. Online condolences may be left at www.kidwellgarber.com.