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Ok that is unfortunate to hear.
Myocardial infarction means damage to the heart muscles.
Ischemic heart disease suggests reduced blood flow to the heart muscles due to the atherosclerotic plaque formation in coronary blood vessels.
Reduced blood supply causes gradual damage to the heart muscles during exertion.
This results in heart failure over time as heart gets weakened.
Usually heart failure related death during sleep is considered painless -- in fact 'best form of peaceful death'.
However, again it is a conjecture given that there was no witness.