Electronic Arts has the official NFL license wrapped up, so any competing American football video game products can’t use real NFL teams or players. So, they have to find other ways to attract gamers.
They can sign retired players, and in this preview of All-Pro Football 2K8, we see that one of the former players 2K Sports uses is O.J. Simpson. In the game, he plays for a team called the Assassins, and the preview’s worth it just for the crowning moment at the end.