User blog comment:EmpyreanSmoke/Supernatural Q&A/@comment-3045936-20150916131650/@comment-95.112.174.181-20150916142539

Death in Supernatural only means no longer existent in the physical universe, but the deceased humans still exist in heaven or hell. God makes it that way in the first place. But if God himself would die, I would think this means he completely ceases to exist.