Don't Make Me Mad
Toni's ma is still angry at him, for one good reason this time. After you took those shots of Casa, he's stopped paying his protection, and she wishes you had his guts because of the recent event. Toni takes that comment literally.
Butchering the Butcher
Meet Casa at his deli, before going over to the Liberty Sawmill. You attempt to kill him with an industrial angle-grinder, and that leads him to run away. Once you get close, lamp him with the hatchet to take him down and then you can kill him. Lose the wanted level and take the "sausage meat a la Casa" to the deli.