Oh man, that is sad news.
I had some brief engagements with him over W3D/Renegade related things. He was a very spontaneous man with a lot of crazy ideas, and seemingly his modus operandi was to always "try a bunch of things quickly and see what sticks". You could turn your back to him for a moment and then return to witness a whole bunch of crazy shit happening.
This spontaneous behavior always put Zunnie at odds with people who did things more "carefully", and it is why he was sometimes a challenge to work with. But one thing is clear: He had a lot of fun doing what he did, and I dare say he knew how to have fun with development much better than most people did.
I have no idea what he worked on at MPF, I do hope he had fun doing it... Ultimately that is all that matters, right?