It is mandated that passenger aircraft carry defibrillators, which crew can operate.
I have had at least three passengers die in some of my flights. The last one the defibrillator was on board and though used, he couldn't be saved.
It was mentioned the captain was a 45 yr old man.
That's sadly rather young.
I wish someone was able to fill us in on the exact circumstances sorrounding this gentleman's demise.
What we are doing here is totally misdirected speculation.