sentences:  On July 22, 1962, Doran signed as a free agent with the Denver Broncos of the American Football League, but his season ended after injuring his back during a victory against the Dallas Texans and being placed on the injured reserve list on August 27.Doran rejoined his old Detroit Lions head coach, Buddy Parker, as an assistant with the Pittsburgh Steelers for the 1964 and 1965 seasons.He returned to Iowa to farm after football.