Loss of neurological functioning is common in late stage alcoholism. Inability to remember events, loss of the "filter" most of us have between our thoughts and our actions.
What's next? I don't know. If you're looking for help, you may want to try to start the 'involuntary rehab' process. If your father is a danger to himself or others (which it sounds like he is), you can have the police come over. They have the ability to involuntarily detain him in a mental health facility if they think he's dangerous.
And, as Easeful said, the DTs can be life threatening if they're ever in a situation where they can't have alcohol. That's why it's always better to detox under the eye of trained medical types.
I'm very sorry you have to deal with this.