Ken Clark, one of the top all-time rushers at Nebraska who went on to play for the Indianapolis Colts, has died. He was 46. His cousin, Stephanie Clark of Omaha, confirmed Clark's death. She said he died of a heart attack in Minneapolis on Saturday. Clark was a two-time All-Big Eight running back for the Cornhuskers, rushing for more than 1,000 yards both his junior and senior seasons.