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Hmmm,
Velly intelesting bit from the link you posted:

Although people cannot detect the odor from a newly-dead body, flies, especially fleshflies (Sarcophagidae) and blowflies (Calliphoridae), swarn to the odor from as far away as two miles. In wooded area, especially where there have previously been dead animals or humans, they begin to land on a corpse within seconds, and within on hour some species may produce maggots. Even in area without prior bodies, they land on exposed corpses within the first few hours (wrapping or burning a body delays this).

I can't be sure, but I think when they speak of "dry" conditions they're talking about a real desert - i.e. the Sahara - not San Diego (poison oak doesn't grow in the "real" desert IMHO). Note that these guys say blowflies "swarm from up to two miles away".

Unless DW had an accomplice it appears that he didn't do it.
IMHO, that is.

FRegards,
PrairieDawg