Officials with the Iowa Department of Natural Resources said today (Wednesday), a Harlan man was killed Tuesday evening after falling from a tree stand while hunting deer in Monona County. 21-year old Corey Custer was coming out of his tree stand at approximately 7-p.m. Tuesday, when he fell approximately 18-23 feet while bow hunting for deer southeast of Onawa. Custer suffered head injuries and was pronounced dead at the scene.