The Tarrant County (Texas) medical examiner's office on Sunday said the death of 42-year-old Kirk Franklin of Saginaw, Texas, was a suicide.
Fort Worth police have said a man who was camping in the infield died of a "self-inflicted injury" after getting into an argument with other campers. The incident happened late in the Sprint Cup race.
Police spokeswoman Cpl. Tracey Knight has said alcohol may have been a factor. Knight said several people witnessed the incident, but nobody was in danger. (USA Today)