An autopsy released this morning ruled the death of UNC assistant track and field coach Antonio Pettigrew to be a suicide.
Pettigrew was found dead in his car in Chatham County early the morning of Aug. 10. He was 42 years old.
The report written by the N.C. Office of the Chief Medical Examiner lists the official cause of death as diphenhydramine toxicity.
Diphenhydramine is used to treat allergies and sleep loss, and is the active ingredient in Unisom, a sleeping pill that Pettigrew had an open bottle of in his car the morning he was found.
The investigation report said that Pettigrew had been having stress at work and that he had suffered neck and prostate problems prior to his death.