Authorities say heat stroke is to blame for the death of former Dallas Cowboys running back Marion Barber III.
The Collin County medical examiner's office said the 38-year-old's death has been ruled an accident.
Police were performing a welfare check when they found Barber dead in his apartment in Frisco, Texas, on June 1.
A fourth-round pick by Dallas in 2005, Barber made the Pro Bowl in 2007. He rushed for 4,780 yard
