Marion Barber, the late Cowboys great, died of a heat stroke, according to the medical examiner.

Several reports say that the office of the Collin County Medical Examiner has said that former Dallas Cowboys running back Marion Barber III died of a heat stroke.

On June 1, Barber's body was found in his apartment in Frisco, Texas. He was 38.

Barber played in the NFL for seven years and ran for 4,780 yards and 59 touchdowns. 

Barber, who was named to the Pro Bowl in 2007, played for Dallas from 2005 to 2010, and then for the Bears in 2011.

In a statement released on June 1, the Cowboys said, "We are heartbroken by Marion Barber III's tragic death." 

"Marion was a tough, old-school football player who ran every down with the will to win.

He loved the game and cared a lot about his coaches and teammates. During this hard time, our thoughts are with Marion's family and friends."

Marion Barber II, Barber's father, said in June that the way Barber's body was in made it hard to figure out what happened, even though officials had ruled out foul play and trauma.