Wow. You'd think he'd have learned his lesson regarding alcohol after what happened in the past. I'm sorry that I ever wanted him here. Lifetime ban, party of one, please.
I don't know if there is an addiction issue and/or a depression issue (etc) since I don't know him, but if one of those issues exists, it speaks to the nefarius power of it.
None of that excuses a violent act, but I tend to be less aboard on a lifetime anything without more info.
If it is a mental health and/or an addiction issue, I hope this incident leads to him getting whatever help he needs. Unfortnately, these events often do not result in long-term changes to behavior if the core illness isn't really addressed.