It was not a part of God's perfect plan for his universe. The witness of Scripture is that death is a backroom impostor, gaining access to God's good earth only through the sinful rebellion of our first parents. You will surely die. For, as is obvious, the bodies of Adam and Eve did not expire at that moment when they ate of the forbidden fruit. In its most essential form death is separation .
Death is separation.
In this way death DID come immediately to Adam and Eve. The closeness, openness and intimacy that had been there between man and wife was gone. It had died. That death exposed itself even more hideously when Cain killed brother Adam. The empty gap once filled by this loved one seems like a huge black cavern.