Yep. As far as I know it was about money owed. There are photos of Dorian just after it happened sporting a black eye.
I remember those from around 2004. I think that's when it happened.
I didn't know the name of the man who punched him though, so thanks for posting that.
I remember Craig Titus saying he slapped around a middleweight fighter. I think he was in the UFC - or Craig claimed that, if I recall correctly.
And then Craig's beef with Phil Baroni.
With what I know about MMA fighters now, I can't see any bodybuilder doing anything to a trained MMA fighter - let alone a UFC fighter.