Roy was the son of Charles A. and Jennie V. (andrews) Horton. Roy married first Nina J. Barber and they had one son, Charles Cortez Horton. Roy married second Mary. He married third Catherine in Chicago and they had one son, Roy E. Horton.
Roy worked for a time as a civil engineer for International Harvester. He died in Chicago when he fell from the roof of a hotel he was working on as an engineer in January 1929.