It looks like heart disease was the culprit.
Linky
Mays died Sunday at his home near Tampa, Florida. The Hillsborough County medical examiner Dr. Vernard Adams said Monday that Mays had heart disease.
Mays' wife, Deborah Mays, released this statement Monday: "While it provides some closure to learn that heart disease took Billy from us, it certainly doesn't ease the enormous void that his death has created in our lives."