Williams, a teacher at Salesian High School in Richmond, told police the caller talked of how he intended to kill several persons, then last; Sunday said: “You’re the dead duck.” Williams went out and when he returned home found someone had pried open the screen on a back door. However, a police search showed nothing was missing. But after the officers left and Williams took a drink from a bottle of opened soft drink in his refrigerator, he found it tasted “metallic” and immediately spat it out. Police reported Friday that the bottle contained more than enough arsenic to kill a human being. Williams said the caller identified himself as the still sought Zodiac Killer of five, but police discounted the idea. The caller would “sob and complain of headaches". Williams said, and on one occasion said he had gone to a Martinez school in search of victims but left when he found police there. Williams said the caller told him: “I’m too smart for them".
One famous blue house, built in 1886 and immortalized by French singer Maxime Le Forestier, was located at in the Castro District at 3841 18th Street, San Francisco, near Haight-Ashbury. The nearest claimed Zodiac crime to the "blue house" was the murder of San Francisco Police officer Richard Radetich, who was gunned down by three shots from a .38 caliber revolver at point blank range through the driver side window of his vehicle while in the process of serving a parking ticket. He was sat in his police car near 643 Waller Street. This location is less than a mile from the blue house.
The only reason I have covered this topic of the famous "blue house" at 3841 18th Street in San Francisco, is because of two San Francisco Examiner advertisements dated February 23rd 1962 and March 6th 1962, from a resident of 4117 19th Street, San Francisco, selling oil paintings under the pseudonym of "Zodiac". The first advertisement stated "16 CENT. Catholic-Spanish oil, $750. ZODIAC, 4117 19th St". The second advertisement stated "16 CENT, oil painting of Christ, $750. Zodiac, 4117 19th St". This residence was situated only 562 meters from the "blue house" in San Francisco. Irrespective of whether any connection exists to the "blue house" at 3841 18th Street, these are an interesting pair of advertisements using the pseudonym "Zodiac" in San Francisco. The next time we would see the pseudonym appear in an advertisement pertaining to the Zodiac case, was the Deep Real Estate message placed on August 26th 1976 in the San Francisco Chronicle, to run for one week.
The following newspaper cuttings in relation to their proximity to the "blue house" were brought to my attention by Cragle, a regular contributor to the Zodiac Killer Site and Zodiac Killer Message Board forums.