Zodiac Killer Bomb

On June 26, 1970, The San Francisco Chronicle received yet another communiation from the Zodiac Killer. The letter was confessed to shooting a man sitting in a parked car with a .38, and lists what some believe is a body of 12.  He moves on from punishing people by blowing up school buses, as he is quite angry that they are not wearing the buttons he's asked them to wear. My interpretation of this request is that he is inspired by the military buttons he receives for his accomplishments. In a theoretical way, he is asking the public to acknowledge his accomplishments. This letter also contains a 32 character cipher in the form of coordinates, and he directs that the map he included along with the code will tell you where the bomb is and that we "have until fall to dig it up."  As you know if you are familiar with my theory due to the timing he lines out, it seems as though he is saying that he is the bomb (like a ticking time bomb) and if he is not caught, he will kill again in the fall. This is very striking to me, because on the official last date of summer, Labor Day, Donna Lass disappears in South Lake Tahoe.  In 1986, her remains are found, however, they are not identified until 2024.  They were found west Donner's Lake, which is east of North Lake Tahoe. As we continue to study the case, we also see connections with conservationists - with Mt. Diablo AND the Peek Through The Pines Card referencing the Sierra Club.