I have not looked into suspects but I did read a list of the main ones and who and why they were ruled out. One not ruled out is this one: ROSS SULLIVAN Why Suspected: The 1966 murder of Cheri Jo Bates in Riverside, Ca. bore many similarities to the Zodiac killings. Staffers at the Riverside City College library, near where Bates’s body was found, said a coworker, Ross Sullivan, had made them uncomfortable and disappeared for several days after the murder. Sullivan also sported a crew cut and glasses similar to the composite sketch of the Zodiac. He moved to northern California in 1967 and was hospitalized several times for bipolar disorder and schizophrenia. "Sullivan wore an Army jacket and military-style boots like those that left footprints at the Lake Berryessa stabbings. Zodiac buffs also note that his letters mention “The Mikado,” by Gilbert and Sullivan, which could be a reference to Sullivan’s name". https://www.history.com/news/could-any-of-these-men-have-been-the-zodiac-killer Guy looks just like the sketch.
