Who killed roger babbit?

Anthony finds Roger in the bathroom. By this point, he is full of rage and is not as susceptible to buttering up as usual…

Anthony: "I've been looking for you, Roger. Now that I've found you I have some things to settle with you. "
Roger: "Anthony, what can I do for my favorite actor?"
Anthony: "Don't you favorite actor me, you son of a bitch."
Roger: "What the hell is that about? This how you talk to your director?"
Anthony: "Some director! You're an asshole!"
Roger: "At least I'm not a washed up has been. You're lucky I give you work!"
Anthony: "Now you've gone too far!"
Roger: "What are you going to do, go cry to Uncle Jessie?"