She needs to disappear, and the sooner the better. This guy may actually become even more dangerous now. In his messed up head he’s probably going to blame ~her~ for his injuries and disfiguring scars.
This sounds like the beginning of Alzheimers. It affects people in different ways. After that many years of marriage and grown children, I going with mental problems.
He’s going to probably be in the hospital for quite a while, and then at some point he may have to serve time in prison if he doesn’t die from his injuries.