What I read, FWIWs, is that the autopsy determined a fatal heart attack.
Allegedly, his widow told some newsie that he had a double by-pass operation in 2006.
If all of this is true, I suspect the FAA's medical recertification process will be subject to review, at least for first class medical certificates.
I recall we had a captain about his age die of a heart attack on a layover in Hong Kong. But, it did not happen in-flight and he did not have a history of a by-pass.
We had another who was medically disqualified when young for an abnormal heart condition. ALPA helped him fight it and he got his medical back after a year or two. Many years later he was in his late 50s and had just commuted home to California from JFK after operating a flight from Tel Aviv. He was resting in the living room while his wife prepared dinner. He slumped over deceased from the condition that was detected many years before.