This is true. I know nothing about this man (the shooter) and do not know the whole story of how he came to shoot a person in the head simply for ringing his doorbell. My gut tells me there has to be more to the story.
However, his life is over. He is likely facing a very stiff prison sentence and until then he will be stalked wherever he goes.
If he shot someone in the head through a closed front door for ringing his doorbell, his life SHOULD be over.