His doc has released the results of the autopsy.
It says that Mr. Russert had asymtomatic coronarty artery disease which lead to hardening of the arteries. But that isn't what killed him.
A fresh new blood clot formed, broke off, lodged into one of the main arteries and ruptured, triggering the heart attack. Scary thing!!
In spite of that, he was said to have things under control with medicine. Even his cholesteral level was under control. He also passed a stress test back in April.
Never even knew that the guy was sick at all!!