Is marvel nick fury immortal?
No, at least they haven’t reveal that as of yet. However, he was a member of S.H.I.E.L.D who have advanced tech and robots that they used as decoys. In the latest “Secret Avengers #5” we find out that Nick Fury’s brother created a synthoid replica of Nick and using the zodiac key gave it the same personality and memories and it has a name and its Max. But for the longest time he thought he was Nick and acted like him. He would escape the helicarrier and stop the bad guys like Nick and he would get caught and studied by the real Nick and he would escape again so he was deactivated or so Shield thought and he was reactivated by the Shadow council.