From what I gathered after watching, Steve(Rita's boyfriend) was the killer. The identity of the guy being beaten up holds no significance to the story. Rita witnessed the beating and that made her leave Walter (the cop). In the scene where Steve and Walter get into a fight Walter chooses not to into a beat the *beep* out of Steve before Rita's eyes (as he has done before but with some other, random guy) but rather chooses to have his own *beep* beaten out of. This way Rita will hate Steve just as she hated him when he was in Steve's position in the past, when he beat up a non specific person (could have been Rita's ex-ex-ex for all we know, that's irrelevant). So Rita turns now Steve to the police and that's that, I guess. See, murdering a stripper is Okay but when you beat up someone that's crossing the line. Also I guess she sees how Walter has changed his evil ways and decides she should be a good person too or something. Still murdering a stripper was OKAY to that point in her eyes. Yes, this movie makes no sense.
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