Who is Carver in the book Staying Fat For Sarah Byrnes?

Carver Middleton is Moby's mother's boyfriend. He appears to be a weak-willed man when Moby first meets him, but he is actually revealed to be a mild-mannered accountant who turns out to have some hidden traits. Carver is Vietnam Vet who decides that Virgil Byrnes deserves to be punished for what he has done to both Sarah Byrnes and Moby. Carver hides in Virgil's house until he comes home and then the two men get into an altercation that leaves Virgil badly injured. Carver admits on television that he hurt Virgil because he came at him but that he was glad he came at him because a man like Virgil deserves to get some of his own medicine. Carver serves several months of a work-release sentence for his actions.