Unwanted

What's the correct way to greet somebody whose death we've been plotting? May be not as bad as that, but pretty close.

The unacceptable way things happened, the betrayal, the grief and the contiuous unhappiness this person causes. All of this to one of my dearest friends. After years of hearing about one incident worse than the other, but happily spared his presence, we were all of a sudden face to face. There was no way to look other than straight into his eyes. So what do you say? The only thing that came to mind was a harsh 'what are you doing here?'. No smile, but I didn't cause a scene either. My body language probably gave it all away anyhow.