Alan Robinson, 62, started his final marathon Sunday morning. Robinson is a walking quadriplegic, also known as an incapable quadriplegic, and has completed 20 marathons following a tragic drunk driving accident in 1991, reports WGNTV. The marathon started at 7:30 a.m. in Chicago and Robinson was at the 18-mile mark around 10:45 p.m. when a friend finally convinced him to stop. Per WGNTV, Robinson recently survived prostate cancer and lives with a serious heart condition. It is not certain yet if Robinson will finish the 26.2-mile race on Monday. Follow Breitbart.tv on Twitter @BreitbartVideo