Posted by Sabrina B. @gametimegirl They called him Sweetness, but Chicago Bears great Walter Payton had a dark side, according to a biography to be released Oct. 4. An excerpt of “Sweetness: The Enigmatic Life of Walter Payton,” by Jeff Pearlman will appear in the Oct. 3 issue of Sports Illustrated and describes the Hall of Famer as suicidal, abusing pain medication and dealing with a crumbling family situation.