Here is a trailer to the documentary regarding Tom Hanson's plan to catch Zodiac:
When I first read about his plan, I thought it was amazing so I spent dozens of hours trying to figure out who his suspect is, but no luck. I went to ridiculous lengths, even flipping through every single page of the 1969-1970 San Francisco directory, trying to find any small clue that would help.
In the trailer you will see they show a man in a courtroom. That man is Earl Van Best Jr, who I mentioned previously. I don't want him to be Zodiac just because his son is a d-bag who has made a name for himself by writing a book about his father being the Zodiac. A lot of the things in his book are crap and have been disproven, but this trailer makes it look like Van Best is also Tom Hanson's suspect so now I definitely have an interest in Van Best. I hope everyone reads the interview with Hanson that I posted earlier because it's one of the most fascinating things you will ever read.
Personally, I think that there was an original killer and a 'partner' who would write the letters and then the last confirmed murder (Paul Stine) was committed by a 2nd killer. If I was forced to guess, I would guess Arthur Leigh Allen was the original killer, Fred Manalli was the one writing the letters (although Ted Kaczynski's handwriting is very close, and he was into codes and bomb making, obviously) and I have know idea who the Stine killer was. Maybe it was Van Best. Maybe Larry Kane. Either way, I do think there were 2 killers, a letter writer and possibly even another person or two working behind the scenes.