Who killed roger babbit?

Alyssa and Roger sleep together when they feel like it. They had a relationship years ago, but now they don't mean much to each other at all. Roger asks Alyssa to serve as his eyes and ears on set. They always talk about the others while in bed together…

Alyssa: "Everyone hates you."
Roger: "Already? We Just started filming."
Alyssa: "You become a real jerk when you start a film, Roger. You're not your usual charming self."
Roger: "I know it. That's why I surround myself with people I know have my back, like you and Michael."
Alyssa: "Please. You know I'd ditch you in a second. And Michael knows you stole his script."
Roger: "He does? Shit!"
Alyssa: "Not that I care, but he's pretty pissed off."