This is from the STEELBOOK back cover by First Look Studios. It reads, "Inside the most corrupt prison in Europe's Eastern Block, the warden pits prisoners against each other in fights to the death for profit. The newest contender is Kyle serving a life sentence for killing his wife's murder. His savage rage may be what saves his life."
Now if you watch the movie you will find that he doesn't kill the killer. So the back cover is just a horrid paragraph typo.