Indeed, Senoufou:

amongst classical musicians on the East Coast,
I recall a story a few decades back. I will keep him anonymous.
His career was focussed largely around the Greater New York City area,
where there are more jobs in terms of classical singing.

He was abstemious, fitness-minded, locker at the gym, and so on.
And he had a fatal heart attack AT THE GYM. He was mid-60's in age.
And he was the last person on earth
that anyone expected it to happen to.