Dirty cop + Felix Barbosa
I didn't really understand the setup scene where Felix wears a wire. Felix is the "informant?" Wasn't Felix above Jason and John Hull on the drug dealer's hierarchy. So he was basically confessing to nab people beneath him? Doesn't make sense. And the dirty cop who met Felix at that boxing ring, was he Felix's partner? I missed what John's narration said.
I guess if he was assoicated with Felix and they were worried about Jason ratting out Felix, it would make sense to kill him, but that whole sting operation seemed strange, especially that they'd be using a pretty prominent "middle manager" drug dealer to nab people lower on the food chain.