There are different of stages (levels) of death.
1. Death is “the spiritual state of no more opportunity to repent” of your sins — permanent Judgment. You must have gotten all things right with God before this clock ticks out! 1 John 5:17
2. Death is when God commands your spirit to depart from the body you have occupied on this earth (what we all think of when hearing of a person’s death). Hebrews 9:27
3. Death is “the living dead” — a backslider or prodigal condition having walked away from obedience to Jesus and refusing to return. In the Parable of The Prodigal Son (representing God and us who enjoyed a righteous condition with Him), the father says ” my son was dead and is alive again.” Luke chapter 15 shows that a person can be dead spiritually while still alive physically. That’s why Jesus came — we were ALL dead to God, NO relationship with Him.