Well, he’s had his first kill and no doubt will have more, unless he is locked away from society for many years. There are monsters among us and a few of them are even as young as ten.
If he’s an actual psychopath, there is no cure except removal from the gene pool.
He will get a chance to off a few other people while he is in prison too... That’s how a dope dealing or stolen car sentence turns into a death sentence. It would not surprise me too much if he messes up another juvenile while he is waiting for the juvenile court to do its thing.