The document revealed three primary causes of Davis' death:
A) Ventricular fibrillation -- a dangerously abnormal heart rhythm
B) Congestive heart failure
C) Cardiomyopathy -- heart muscle disease
According to the death certificate, Davis died at the Oakland Airport Hilton at 2:45 a.m. on Oct. 8.
The document showed Davis 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 document, 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.
He was 82 at the time of his death.
(Copyright 2011 by CBS San Francisco. Used with permission from TMZ. All rights reserved.)
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