Initial autopsy results suggest that infomercial celebrity Billy Mays died of heart failure, the medical examiner announced today. The autopsy didn’t reveal any head trauma or drug abuse, both rumored causes of the 50-year-old's death, but did find hardening of his arteries, the St. Petersburg Times reports. He was also taking pain medication following recent hip surgeries, but there was no evidence they would have caused his death. (More Billy Mays stories.)