Oakland Raiders owner Al Davis died from a broken heart
This according to his death certificate obtained by TMZ.
The document reveals three primary causes of death:
A) Ventricular fibrillation -- a dangerously abnormal heart rhythm
B) Congestive heart failure
C) Cardiomyopathy -- heart muscle disease
According to the death certificate, Al died at the Oakland Airport Hilton at 2:45 AM on October 8th.
The document shows Al had been diagnosed with cardiomyopathy years ago ... and suffered a ventricular fibrillation just 15 minutes before his death. Davis also suffered from Merkel cell carcinoma -- an aggressive form of skin cancer.
According to the doc, Davis -- who was involved with the NFL for 60 years -- underwent throat surgery just three days before his death. Davis also had heart surgery in 1996.