The Man on Aisle 7

A middle aged man who grew up in Texas lived alone in a small apartment in Sioux Falls, South Dakota. He was unmarried and had no children. He had no family in the area. He had apparently chosen the city at random. He slept in a sleeping bag on the floor of his apartment because of an old back injury. He worked at the local Sunshine Food Stores stacking shelves by day. After work and in his free time, he wrote. But the imposing man who looked like a college English professor looked out of place. How and why did he come to choose that place, and who was he?