Storm Bull is an associate of Zorak Zoran. Looking at the Create Zombie spell in the Red Book of Magic p38, it has the runes darkness and death and the statement "Zombies do not have the spirit of the original owner bound to them; instead, they are mindless magical constructs, like animated skeletons." which is also how they are portrayed in the Bestiary.
The description of Shun Mun in the Guide p572 - a city owned by Gark - describes the corpses as being animated p572 rather than as RW zombies. However since Gark has the runes of Chaos, Harmony and Unlife, his priests (as opposed to his metabolically challenged rank-and-file) would register as chaotic.
I've seen a statement, not in this thread, that Nontraya is nonchaotic. Nontraya is described as chaotic in the Guide p706.