At the moment, no, Rudolph Van Richten has no official 3rd edition stats.
For that matter, in Bleak House, a number of possibilities occured that essentially, in one form or another, put him out of commission. Not all necessarily bad, nor even necessarily a ghost. Just that it's unlikely he'll be popping up again any time soon.
For that matter, in 2nd edition, he apparently had a number of different stats depending on in which book you looked, due to experience, level drains, and the like.
If you needed to stat him out, I'd peg him around 10th level, with levels in Expert, Rogue, possibly Fighter or Ranger (he did do quite a bit of traveling, after all, as well as hunting, of a sort), and perhaps a few of the non-magical, scholarly inclined Prestige Classes (Ravenloft has a few). Ranks in Heal, Profession (Herbalist). I believe he used a gun, though I can't say for certain. Anyway, there you have it.