Is it likely Bruce McGregor Davis is the Zodiac? Unlikely. Is it possible Davis killed more people than he was convicted of killing? It's very possible. A better question, do you believe the Zodiac story? The documented 7 murders are difficult enough to connect without validating the claim of 30 others. On the other hand, Bruce McGregor Davis is a known commodity with remarkably consistent links to several high-profile murders – both Zodiac and non-Zodiac related.