Or possibly until Joe Simon dies.
since it seems most folks in the marvelverse are clones, robot copies of themselves or skrulls impersonating them... I reckon it was a SHIELD LMD... but it's comic book death. it's not going to be permanent, let's face it.
Well, the Captain was acting like a self-righteous arrogant jerk through most of Civil War--the explanation is obviously going to be that he was some sort of clone whose personality didn't quite "take."Andrew Reeves