Death certificate says Al Davis died of heart failure

According to the San Jose Mercury News, former Raiders owner Al Davis’ death was due to heart failure. Davis’ death certificate states that he died at the Oakland Airport Hilton at 2:45 a.m. on October 8 from congestive heart failure, cardiomyopathy, and ventricular fibrillation. Davis’ heart is believed to have begun to fail just 24 hours…