Dr. Nightmare has not died lads.. he is very much alive and well.
I kept in contact with him on facebook after he left here, i also see him on a couple of other sites from time to time. From what he's told me, the reason why he left was due to a disagreement he had with 1 or 2 people on here.. he was just burnt-out from all the drama it had been causing. I do think there was more to it than that, because he cut all ties with everything to do with action figures, collecting and customizing!! But thats all he's said on the matter and i've never asked again since.
It really is a shame because as joey said, Doc was 'staple' of this site. The amount he actually contributed to the site is astonishing!! From the many informative tutorials, to the 100's of customs, 100's of figure reviews, 100's of comic concepts and the 1000's of comments!! A really nice fella.. he's definitely missed around here.