Robert Leroy Anderson

Leonard Lakin, Charles Ng, the Boneyard Killers, they also had a female accomplice named Cricket, and they were ultimately figured out.

Robert Leroy Anderson, the duct tape killer from the Midwest, from South Dakota, he also had accomplices.

They were caught and busted, and everybody figured it out.

With the Zodiac, I mostly think the Zodiac was one person With Jack the Ripper, I would absolutely be more open to multiple killers in that one, but I'm still going with one person.