Nope, he had been around for a long time talking about the case. Interesting thing is that he ending up backing away a bit from some of the more dramatic events of the "real life exorcist case" before he died. Strange Magazine did a good expose on the whole affair if any W's are interested.
Via Buffyworld: Here (almosthuman.net) is a small article (just a bunch of captioned pictures, really) detailing how they made The Beast from last season. The on set pictures are nice. Here (buffyworld.com)