The Zodiac Killer appeared to have a penchant for the theatrical, referring to Gilbert and Sullivan's Mikado on no less than three occasions, particularly in the Little List Letter he mailed on July 26th 1970, but additionally the Exorcist Letter on January 29th 1974, as well as further indications to the theater with the Red Phantom Letter on July 8th 1974, all suggestive of his artistic leanings. It is not as simple as this, but placing the theatrical element alongside his apparent knowledge of fabrics, either from a design feature or a knowledge of weave, gives us a small avenue of hope. If the Zodiac Killer had a connection to the theater, then being employed in an artistic capacity, such as a costume designer fits the bill, and if not, a knowledge and access to these materials could still be readily available from an opportunistic standpoint.
His use of a marker pen in his letters and the car door at Lake Berryessa, is a necessity often used to mark fabric, where traditional pens do not function. Such marker pens are standard tools employed by seamstresses, tailors or indeed costume designers. Pinking shears are used for cutting woven cloth to limit fraying and could have been used in the design of the Pines Card mailed on March 22nd 1971, where the edges of the card appear to have been scalloped. Wikipedia shows the word 'pink' to date back to 1300, meaning to stab, pierce or 'make holes in'. That leads nicely onto the punch holes apparent on the 13 Hole Postcard and Pines Card, although both disputed Zodiac material, it is believed these holes were formed using a hole punch, readily available to buy and used as standard office equipment, but equally could have been crafted using a non revolving leather punch, used in the design of belts and shoes.
Some Zodiac researchers have suggested the possibility the Zodiac was of English origin, on account of his word usage, such as 'shall', infrequently used in American English, but by the same token a word frequently used by thespians or people with close links to the theater, after all, its about exposure to a word and the circles you travel in, as opposed to your country of origin.
The Zodiac Killer in his final confirmed murder of Paul Stine at Presidio Heights on October 11th 1969, was believed by the reading of the taxicab meter, to have collected his final passenger from the theater district in San Francisco, somewhere close to the intersection of Mason and Geary Street. We know the killer was last seen heading north on Cherry Street. As for his final destination we are still unclear, but if he had no vehicle sitting in wait, the emphasis on the wealthy Presidio Heights area and the pick up point from Mason and Geary may carry greater significance. Whether or not our killer had close ties to either San Francisco or the theater is still up for debate, however the Zodiac Killer's exit stage left, towards Cherry Street, is not and remains our one abiding memory of a killer who has evaded the spotlight for close to fifty years.