OKLAHOMA CITY -- The Oklahoma State Athletic Commission is investigating the death of a Toughman contestant.
Commission director Joe Miller said Wednesday that 23-year-old Nathan Johnson of Latta apparently suffered a head injury during a weekend event at the Oklahoma City Farmers Public Market.
Miller says Johnson was lethargic and non-responsive after winning his second fight Saturday.
OU Medical Center spokesman Allen Poston says Johnson died Tuesday, but he can't release details about the ex-college baseball player's death.
USA Boxing doesn't regulate Toughman bouts, which feature novice boxers.
The state commission licenses the events and requires a doctor and paramedic to be at the matches. It also requires participants to have pre- and post-bout physical exams and wear protective head gear and gloves.