Doesn't really help too much, but gives a little more info -
http://allmusic.com/cg/amg.dll?p=amg...1:dcfwxq85ldte
Doesn't mention his death, though!
I do remember reading something some years back, in which Carlos Santana referred to his departure. He said that he was sacked because of some kind of drug possession/conviction, etc.
Hope this helps a little?