Even if that was a certainty, you'd gain nothing from living in fear. There isn't anything you can meaningfully do to prevent it. That's actually fairly liberating.

Being scared of death is one thing, it doesn't make any difference whatsoever how that death comes to pass or when. So until that day comes you'd be best off to just live your life the way you want to. Living in fear doesn't help anyone, especially not you.

If you want more depth on this vision on living, look up 'optimistic nihilism'.