Any thoughts or tips for dealing with someone with a serious alcohol problem?

I’ve got someone I have to try to help with a major league drinking problem. They drink every single day, but recently it’s gotten worse. They’ve been drinking at work and their boss and coworkers are aware of it, early in the day, just about all the time. They recently showed up for a lunch date completely hammered. The family was able to get them to go to the crisis center, but the crisis center wouldn’t take the person in because their BAC was so high, .36. This was after 2 hours with no alcohol. After the BAC was down they checked this person into the hospital and they went through the night with serious DTs, vomiting, the works. The next day the person signed themselves out of the hospital, denying they had any kind of problem. I don’t think the immediate family is going to be much help for various reasons. Any thoughts would be greatly appreciated. Please keep this person’s id quiet if you know who I’m referring to.