Unbeknownst to anybody reading the Roseville Press-Tribune on January 23rd 1986, other than the person who murdered Donna Lass, the discovery of her body in the Yuba Gap area of Placer County was being detailed. Therefore, it must be regarded as a curiosity, that the next Zodiac Killer communication on May 6th 1986 mentioned the state of Nevada, from where Donna Lass disappeared on September 6th 1970..
The Roseville Press-Tribune newspaper article read "The skull was found by a sheriff's search party headed by Deputy Lowell Carleton, who used scent dogs in looking for remains of the body believed to have been murdered elsewhere and dumped in the Yuba Gap area". Three and a half months later, on May 6th 1986, the Zodiac Killer wrote "The body count is growing now 100+ all over the state of Ca and Na". The "victim count" of the Zodiac Killer had now become a "body count" for the very first time. Only the murderer of Donna Lass, reading this newspaper article, would have known that these remains were hers. So was the Zodiac Killer attributing the finding of her body to his ever growing "body count" - and feeling it necessary to mention the state of Nevada from where she went missing, and the location she was possibly murdered?
* Although the state of Nevada is abbreviated to "Nv" and not "Na", which the Zodiac Killer appeared to write in the 1986 letter, it is reasonable to conclude that he meant Nevada, which shares a border with California.