The recent "retirement" of Allen Iverson reinforces a problem that many NBA players face at the end of their career: dealing with diminished skills on the court and having to battle his demons off of it. It's been enough to essentially force him out of the game. From contract negotiations gone bad to substance problems to devastating injuries, there are plenty of former NBA stars who were forced to cut their careers short and leave the game under less-than-ideal circumstances. Our friends at StreetLevel rounded up ten of the most heart-breaking scenarios ... (via StreetLevel)