According to the autopsy, Marion Barber III suffered from heat stroke

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The Frisco Police Department informed NFL.com on Monday that the Collin County (Texas) Medical Examiner’s Office has ruled that former Cowboys running back Marion Barber died from heat stroke. The office has put an end to the rumors that there was foul play involved and declared Barber’s death to be accidental. Following a welfare check by the Frisco Police Department on June 1, Barber, 38, was discovered deceased inside an apartment. At the time his corpse was discovered, the cause of death remained unknown. The Cowboys released a statement last month in which they expressed their “heartbreak” over Marion Barber III’s untimely passing. “Old-school, tough-minded football player Marion raced with the determination to win every down. He loved his friends and coaches, and he was passionate about the sport. During this trying time, our thoughts and prayers are with Marion’s family and friends.”