A new book about Walter Payton, the Chicago Bears’ legendary Hall of Famer, reveals a controversial, private side of the running back and has drawn criticism from his family.

In Sweetness: The Enigmatic Life of Walter Payton, Jeff Pearlman chronicles Payton’s life from his childhood in Mississippi and battle with a rare liver disease and death from bile duct cancer in 1999.

Excerpts in Sports Illustrated relate tales of Payton’s extramarital affairs, including a scene in Canton, Ohio, when Payton took both his wife and girlfriend to his Hall of Fame induction. Payton, Pearlman writes in detail, battled depression and was addicted to painkillers during his playing career and afterward.