We all should have known this was coming based on statements by Monica's father that he wasn't going to just let this be.
As for the charges, it seems to me that had George called Brandon and not the other way around, that this case would be a lot less likely to go to trial. The prosecution is going to base this on cause and effect. He'll say Brandon's phone call started these events in motion and lay the blame right there regardless of what condition George may or may not have been in from drinking or what the weather/roads were like. IMO, Brandon is going to do some time for making that phone call.
...by the way, I had a daughter at OSU that was exactly the same age as Monica. Had this happened to her, ... I'll just let you use your imagination to fill in the rest.