These are compelling reasons to believe that both communications were composed by the same author. The question being; is the wording in the "good citizen" letter that of a helpful citizen or a mischievous individual playing games with the police. The "good citizen" letter read "On this occasion, while thinking of the code letters, the pencil wrote: Go to 56 Beach Street. I get the name Jerry, perhaps he knows people or his name is SIMPSON". Thanks to some excellent research by "Desmitty11" from the Discord forum, the following police file was shown to me, replacing the unredacted message of "his name is XXXXXXX" to "his name is SIMPSON".
It was apparent that after entering Julius Kahn playground the Zodiac Killer suggested that he had traveled 2 blocks east, which placed him close to Presidio Boulevard that went from south to north west in the south-eastern corner of Presidio Park. From a location 150 feet shy of this road, he was extremely close to the Lyon Street steps and his exit route from the park. If the Zodiac Killer had headed northwards from this location to the Marina District and the area around 1654/1656 Beach Street, he could have opted to walk for 25-30 minutes or enter a vehicle parked on Lyon Street for the 5 minute journey.
If the Zodiac Killer mailed the "good citizen" letter four days before the Paul Stine murder, one could argue that he didn't just pluck the Beach Street address and the name "Jerry" (Simpson) out of thin air. It is possible that Zodiac lived close to Beach Street (or within a reasonable distance) and was familiar with somebody who lived or frequented either 1654 or 1656 Beach Street. As an example, he could have lived somewhere within the green circle shown below. The reason I've positioned the circle this way will become evident in a moment.
Donna Ann Lass (25) In the Pines postcard on March 22nd 1971, the Zodiac Killer pasted "Sought Victim 12", indicating that he had previously targeted Donna Lass between the April 20th 1970 letter (10 victims) and the Button letter on June 26th 1970 (12 victims). Therefore, if the Zodiac Killer had sought her in San Francisco as victim number 12, he would have set his eyes on her between April 20th and June 5th 1970 (when she left for South Lake Tahoe). Because the Dragon card on April 28th 1970 didn't increase the Zodiac Killer's victim total, we can narrow down the time he sought Donna Lass as victim number 12 to between April 28th 1970 and June 5th 1970 (probably sometime in May 1970). During this time she could have been living (or visiting) at 225 Mallorca Way, close to the Beach Street residence. Donna Lass and the Zodiac Killer may have been living near to one another in the Marina District of San Francisco, in an area that had relevance to an address mentioned in one of Zodiac's letters. If we could positively identify the "Jerry" in the October 7th 1969 letter (assuming they exist), it may edge us a little closer to resolving this mystery.
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