Dennis D. Johnson, 69, of Greenbush, Illinois, passed away Wednesday, August 20, 2025, at 11:25 p.m. at OSF St Mary Medical Center in Galesburg. He married Debra Dennis on April 30, 1973, in Roseville, Illinois. He is survived by his wife of 52 years, Debra; two daughters, Jennifer (Shawn) Scott and Ginelle Johnson; four grandchildren, Kolten (Nikki) Johnson, Sydney Scott, Brennan Scott, Kielee McCormick; one great grandchild, Kaden Johnson; six sisters, Tonni (Mike) Mattson, Bonnie Morrison, Judith (Francis) Johnston, Kathy (Sam) Maness, Vicki (Kelly) Mowen, Rhonda Johnson; and one brother, Larry Johnson. Dennis was known for being a witty, kind, genuine, dedicated, and a hard-working man always willing to help others and provide for his family. He loved spending time with his family and friends, fishing, boating, hunting, watching the Chicago Bears win or lose “pitiful, pitiful”, listening to music, and tinkering in his garage.