On September 25th 1990, a cipher was mailed to the Vallejo Times-Herald on the back of a beachfront postcard from Oakland, addressed Celebrity Cypher, Vallejo Times Herold, Vallejo, Ca. This communication arrived approximately six weeks after Robert Graysmith (author of two Zodiac books) and Pam Huckaby (sister of Darlene Ferrin) appeared on the tabloid talk show The Sally Jessy Raphael Show. The show ran from 1983 to 2002, featuring celebrity guests such as Robert Graysmith, along with ordinary members of the public, covering a wide range of social issues.
Pam Huckaby appeared on the TV show in the August of 1990 alongside Robert Graysmith (who had published The Sleeping Lady earlier that year), claiming she feared for her life after a series of sinister events befell her, that included messages and Zodiac signs scrawled on her apartment door, mailed crytograms, a cross placed on her front lawn, a coffin delivered to her residence and bodily harm by an unknown individual, which she asserts could be the work of the infamous Zodiac Killer. These stories by Pam Huckaby are widely discredited, but could an interested viewer have took it upon himself to react to the TV show and mail the Celebrity Cypher postcard to the Vallejo Times-Herald. The name of the newspaper was incorrectly spelled as "Herold" on the postcard, just like the July 31st 1969 envelope, unpublished at the time. In fact, as of 2021, only three communications to the Vallejo Times-Herald have been publicly released, which includes the October 28th 1987 letter - and all may carry the misspelling of "Herold".
The postcard could be a veiled threat toward Pam Huckaby, with the hidden address on the left side of the correspondence being Antioch, CA, to insinuate he lived close by and could strike at any time. Or was the communication directed towards Robert Graysmith, hence the choice of a Celebrity Cypher, originally designed by Luis Campos, an inventor, poet and cryptographer who created six celebrity ciphers a week, featuring famous quotes from well-known people, past and present.