Actually, hypothetically speaking, one could have an MI and die quickly
and not have the blood markers be positive because they take time
(hours) to diagnostically elevate after the infarction.

Larry Dighera wrote:


I would suppose that there would be specific markers for myocardial
infarction evident in the blood if he had suffered a heart attack, but
I have no idea if they would be detectable by the time (absent from
the NTSB report) the autopsy was performed.