On June 26th 1970, the Zodiac Killer mailed the Button letter to the San Francisco Chronicle, upset that the citizens of San Francisco had not complied with his wishes to wear his Zodiac buttons, claiming he had killed a man in a parked car with a .38 caliber weapon. He also designed a 32 symbol code - the fourth in a series of cryptic messages - of which only the first, the 408 cipher was ever solved. Also accompanying the letter, was a Phillips 66 road map of San Francisco and Vicinity. On this map the Zodiac Killer had emblazoned his crosshairs symbol, centered over the peak of Mount Diablo, along with a brief segment of writing, stating it was to be set to Magnetic North. The Zodiac Killer appeared a master of misdirection and false promises, placing the Bay Area into panic by proclaiming he would target a school bus and "pick off the kiddies as they came bouncing out". A threat that fortunately never materialized. His threat to use a bomb in several letters, including the Button letter, also appeared to carry little weight other than to continue his campaign of terror using a pen, as opposed to a bullet.
Many serial killers collect trophies from their victims, often storing them for many years. Items were taken following the murder of Paul Stine in Presidio Heights on October 11th 1969 - and apart from the small sections of Paul Stine's shirt mailed to the San Francisco Chronicle on October 13th 1969, November 9th 1969, and attorney Melvin Belli's residence on December 20th 1969, the rest are unaccounted for. The innate desire to reveal one's identity and take credit for the crimes, is often counterbalanced with an equal desire to remain at liberty and feed the compunction to murder. This is the fine line some serial killers appear to tread - and undoubtedly the Zodiac Killer was no different.
Kevin Robert Brooks takes us to the county seat of Roundup, Musselshell County, Montana where Donald Lee Bujok was born. This area of personal significance is where the Zodiac Killer was directing us all along. All we have to do now, is place the center of the Zodiac crosshairs over the area of Roundup, Musselshell County and follow the arrow placed at the top of the Zodiac crosshairs (set to Mag. N) and see where it takes us.
The two immediate counties above Musselshell County, are Petroleum County (established in 1925) and Phillips County (established in 1915). If we take the crossed circle and superimpose it over the center of Roundup, Montana, the directional north marker points directly to two adjacent counties, that of Petroleum County and Phillips County, thereby giving us the reason behind his choice of map in the first place - and the birth place of America's most elusive serial killer. On the Phillips 66 Petroleum map, the Zodiac Killer added a notation that his design "is to be set to Mag.N" (meaning Magnetic North). In 1970, Magnetic North was approximately 16.5 degrees. If we adjust the crossed circle accordingly by 16.5 degrees clockwise, it becomes even more significant, with the directional marker passing exactly over both county seats of Winnett and Malta, shown on the map above. The county code numbers of Petroleum County and Phillips County are 55 and 11 respectively. These totaled up equal 66, to provide yet another interesting feature regarding the Phillips 66 map. Thanks again to Kevin Robert Brooks.