No reason for the judicial system to be involved here; justice has already been served.
I agree.
You have no idea of how she may have made his life a hell and drove him to another woman. She sure wasn’t being his comfort in life. How often did she greet him home naked? How often did she make him a sandwich for no reason at all and let him watch TV?
So clearly he deserves to be run over by a homicidal maniac.