It has been my experience that the police don’t do anything when you call them and tell them that your spouse tried to kill you. My mother’s husband tried to kill her three times and called the police. They told her that it was a he said, she said and that they couldn’t do anything, despite the bruises and marks on her neck. The truth was that they didn’t want to take financial responsibility for him. They figured if they didn’t do anything, she would have to have him committed to a care facility.
With neck bruises and so on seems to me your state's civil commitment procedure could have been invoked ~ that will provide a hearing, and the cops will come to pick up the target individual BEFORE the hearing.
Somebody there needs to find a lawyer real quick and get cracking on locking up a dangerous party.
You know, it's not just ordinary folks who don't know any of this ~ Mr. Lanza simply abandoned his wife and son ~ he moved out of there to another state after the divorce. But you'd better believe he knew that kid was dangerous. And, he had access to expensive lawyers ~ and he did nothing about the kid.