You MIGHT be able to find out something about cooler if you contact the people at Kitchen Sink Comics/Publications, i.e., Denis Kitchen. I THINK - am pretty sure - that cooler did some work for, represented, or was otherwise somehow affiliated with Kitchen Sink Comics. They were/are independent comics publishers of quite some renown, i.e., The Spirit reprints, Omaha the Cat Dancer, etc. They do have a website.

Also, I think one of the creators of Omaha - Reed Waller - is/was a Poser person of some renown, though I don't remember his user name, but I do think he had some products for sale, or at least freebies.  The other co-creator was a woman whose name escapes me at the moment, and who I believe passed away some time ago. Someone else here abouts might be familiar with him.

At any rate, that tack might give you some kind of insight into cooler and whatever happened to him. He was active on the now defunct 3DCommune, IIRC.