First off, your description of him hiding in plain site is exactly what I think is very possible. I will even go so far as to say that he may have been hiding in plain site on the east side of Vallejo somewhere in the triangle between Blue Rock Springs, Lake Herman Rd. and the Tuolumne/Springs Rd. phone booth. Most serial criminals start their stuff close to where they reside unless they are transient at the time (armed robberies is the very best example of this). The reason I think he was close to home in the first two confirmed, is because I really believe that 50% of the "fun" for the Zodiac was the difficult clues, the game, the outsmarting the police, making them look bad. He got off on that just as much as killing which is the other half. An example of a speculative clue from my perspective: the Zodiac told VPD dispatcher Nancy Slover, "If you'll go one mile east on Columbus Pkwy....." Do you know what street is exactly 1 mile east of that pay phone? Maple Ave. (at Springs Rd.), the same street name (in SF) he told Paul Stine to drive him to in the Yellow cab before making him go one more block west. The thing is, you couldn't go one mile east of that pay phone to Columbus Pkwy or one mile east on Columbus Pkwy. You could go one mile east of Maple on Springs and reach the intersection of Columbus. The directions don't really make sense except the part about the public park on Columbus Pkwy. Was he giving us a clue of some sort related to Maple St./Ave.?To be honest I have swung between two very different theories regarding Zodiac’s identity. I do think the Arthur Allen argument has merit as a lot of evidence does suggest he is responsible for the murders (especially his watch and his history with teens) but there’s something that nags me, a little voice that says it was someone the police never looked into as he was either a transient or else really good at hiding his true personality in daily life to the point no one who knew him connected him to the crimes. If the persona-hiding angle is true then that expands the pool of potential suspects exponentially. That’s why I wholeheartedly support and agree with your idea he was someone never arrested. It would fit with my theory of him being someone who was a master of hiding his true self behind many personas to the point no one could pick up on the depths of his true cruelty hiding behind the masks.
And regarding his last communication being actually in 2001 it might be true depending on how old he was when the killings started. Theoretically if he was a healthy, non-smoking individual he could have lived to a respectable old age and passed away somewhere in a nursing home around the early 2000s which theoretically would mean he would have lived long enough to see the movie based on his crimes be released in theaters. Also I do suspect he might have done earlier crimes (I might have even joked he was the Texarkana Killer but I seriously doubt it) which were never confidently tied to him. According to what I found it is suspected he was behind the 1962 murder of a taxi driver in Southern California, Ray Davis but officials and a lot of armchair detectives have doubts of it being his handiwork. Thoughts?
If it comes back someday that he was right there under the noses of Vallejo PD and the Solano County Sheriff, can you imagine how much joy that brought him knowing they were within "arms reach" of him? If any of this turns out to be true, you are going to see some social camouflage big time: a good job, no criminal history, eventually a wife and kids or step-kids, decent family name, maybe well known in the community, church attendance, youth sports coach, the whole works. My theory is he did not look or act like the boogey man day to day. He looked like the guy next door, a regular dude, a ballgame and bbq kind of guy. But also, this guy could be as young as mid 20's in 1969 meaning by 2001, he could be as young as late 50's. There's a lot of disparity in ages but taken all together it is 25 to 45. That's a big range. I lean towards to the younger side because of: Michael Mageau at BRS saw his face close, through an open car window estimating 26 to 30 yoa. Bryan Hartnell at LB, a person who had an extended converstation with the actual killer, put the sound of his voice as being between 20 and 30 yoa.
The thing with Arthur Leigh Allen is fairly simple in my opinion. Not one shred of usable physical evidence ties him to the crimes. So, even if he did do it, he's never been connected so it is truly an unknown to us. Michael Mageau's 1991 almost positive ID is meaningless and prosecutors knew it. There's no point of wasting time on a guy like ALA. If he is guilty, only the DNA can confirm it.
The earlier crimes are all possibles in my opinion: Ray Davis 1962, Domingos/Edwards 1963, the Swindells 1964, Cheri Jo Bates, 1966, and even some others. Very similar MO's for sure. He could have started all of this as early as his early 20's. It is all possible but it is also not entirely impossible that some other monster was working down south at the time.
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