
On September 13th 1973, the San Jose Mercury reported on the September 10th 1973 murder of Yellow Cab driver Roland J. Canfield (41) of 551 Manor Drive, Pacifica, who was shot behind his right ear at 4:00pm while parked at the intersection of 27th and Noe streets in San Francisco. The wallet of Roland J. Canfield, still in his back pocket, was empty of money. The taxicab strongbox was described as undisturbed. Homicide inspectors David Toschi and William Armstrong, investigatng the case, indicated a lack of evidence to form a Zodiac Killer connection to that of Paul Stine on October 11th 1969.
In the middle of the afternoon Roland J. Canfield received a dispatch to an address at 27th and Noe streets, but when he arrived at the intersection he would have discovered that the address he was given didn't exist. Reports from police, who interviewed the dispatcher, stated that upon discovering the non-existent address the taxicab driver was hailed by a man walking on the opposite side of the street. The fact that this man shot Roland J. Canfield and escaped to a nearby automobile, strongly suggests that the taxicab driver was lured to this location for the purpose of murder (and maybe robbery). A fictitious address followed shortly by murder could be argued as related. The Zodiac Killer has long been believed to have parked his vehicle close to the crime scene at Presidio Heights - although this comparison - would be rightly described as clutching at straws when attempting to forge a link from this crime to the murder at Washington and Cherry in 1969, just over 3 miles north.

On January 12th 1974, after two court proceedings, the second jury in the trial of James A. Montano again failed to reach a verdict, with Superior Judge S. Lee Vavuris declaring a mistrial. The murder of Roland J. Canfield remains unsolved to this day. This Yellow Cab shooting is extremely unlikely to have any connection to the 1969 murder of Paul Stine and the Zodiac Killer, but the mere mention of his pseudonym in the newspapers often created an immediate response from the Bay Area murderer in the form of a letter. On September 18th 1973, it seems he deviated from this pattern and left his message on a tombstone.