Dennis Donald Tillman, age 65, of Red Oak, Iowa, passed away Sunday, March 20, 2022, at the University of Nebraska Medical Center in Omaha. Dennis was born February 14, 1957, along with his twin sister, Diane, in Red Oak, Iowa, the son of Donald and Evelyn "Louise" (Brooks) Tillman. He graduated from Red Oak High School in 1975 and worked several ag related jobs including, the wheat harvest, Star Agri Corporation making hog barns, and driving livestock trucks. Dennis has worked for the United Farmers Coop for the past 35 plus years and was the grain elevator manager. Dennis was united in marriage to Sue Swanson on May 19, 1984. Two children were born to this union: Brenna Sue in 1986 and Brett Lucas in 1988. Dennis was a member of Faith Community Church, where he was active with youth group and adult Bible study. He traveled to Bali, Indonesia, Ecuador, and Guatemala on church mission trips to help the underprivileged. He really liked playing ball and soccer with all the kids. Dennis enjoyed gardening, hunting, fishing, camping, and any outdoor activity. Preceding him in death were his parents: Don Tillman and Evelyn Louise Penry; brothers: Richard, David and infant, John; Step-parents: Pat Tillman and Lloyd Penry; father-in-law: Charles Swanson; and mother-in-law: Phyllis Riggs. Survivors include his wife: Sue Tillman of Red Oak, IA; daughter: Brenna Tillman of Shanghai, China; sons: Brett Tillman of Red Oak, IA and Jeremy Tillman of Portland, OR; grandson: Jonathyn Stiverson of Council Bluffs, IA; sisters: Diane Limkeman and husband Joe of Cedar Falls, IA; Linda Schomburg of Red Oak, IA; Jean Bozwell and husband Gary of Red Oak, IA; Jane Perea of Ft. Collins, CO; brothers-in-law: Mike Swanson and wife Martha of Council Bluffs, IA and Tom Swanson and wife Patty of Sardinia, OH; many nieces, nephews, and other relatives and friends. Funeral services will be held 11 AM Monday, March 28, 2022, at the Faith Community Church. Viewing and visitation will be held from 5-7 PM Sunday, March 27, 2022, at the Nelson-Boylan-LeRette Funeral Chapel. Burial will take place at a later date at the Evergreen Cemetery. Memorials are suggested to the Red Oak Animal Shelter. The family requests that everyone wear casual blue jeans and flannel shirts in memory of Dennis. Nelson-Boylan-LeRette Funeral Chapel is in charge of arrangements.