Former Cowboy Marion Barber III died of heat stroke, according to medical report. He was 39 years old. https://www.msn.com/en-us/sports/nfl/former-cowboy-marion-barber-iii-died-of-heat-stroke-according-to-medical-report/ar-AAZt6hu?ocid=msedgntp&cvid=d2ec44792f714030b3d7d8d7e0975951 GO4AWILDRIDE