According to Police Captain George Stephenson, Bruno and his girlfriend (16 years) had been parked on Monte Cresta Drive, above Barclay Way in an isolated area of western hills when a man opened the driver's side door and apparently without saying anything fired the shotgun. The girl, who was not identified by police, pushed Bruno's body aside and drove the car to her home from where police were notified. She described the assailant as white, 5 feet 5 inches tall, 140 pounds and wearing an Army green parka with hood, according to police. Stephenson said also that a late model brown pick-up truck, possibly a Dodge or Chevrolet, had been seen in the area at about the time of the shooting. The killer then ran south on Monte Cresta from the dark hillside area, past a streetlight 50 yards away, and then possibly to a late model Dodge or Chevrolet pick-up truck.
Belmont police today are attempting to find a man who shotgunned a 17-year-old Carlmont High School student to death in a parked car early Sunday morning. The youth, Anthony Vincent Bruno of 213 Bayview Drive, San Carlos, died instantly, his body sprawled on the seat of the parked car beside his terrified 16-year-old girlfriend. The killer then turned, dropped the sawed-off stock of his weapon on the ground, perhaps by accident, and fled. It was disclosed Wednesday that about an hour and a half before the brutal slaying, a man was seen struggling to drag a box about two feet long and 18 inches wide up a steep rise about 100 feet from the slaying site. A rod, or perhaps a rope, protruded from the box, according to police, and the dragging was being done by a man in mechanic's overalls with longish, dark brown hair. Stephenson also confirmed that police are searching for the driver of a maroon pick-up truck, equipped with blackwall tires and white wheels; a vehicle which they have information to believe may have approached the parked couple 15 minutes before the slaying, stopped a distance away, made a u-turn, and apparently drove off. The girl gave a follow up description "She saw a face but couldn't identify him. She couldn't see whether he was black or white, or anything other than he was 5'5", 140 pounds and wearing a green army-type parka". One has to consider that under the circumstances, this description may be less than reliable.
The image on the right shows Belmont Police Chief William Singer and Captain George Stephenson examining the scene of the crime. To visit the location, click the image to enter Google maps.
The following day, on November 3rd 1975, it was reported by KGO-TV that a possible Zodiac letter was discovered near to the crime scene in a phone booth. Michael Morford, a researcher at the Zodiac Killer Site forum, also remembered a cassette tape accompanying the letter. The attack happened early Sunday morning, with the newspapers carrying the story on Monday, November 3rd 1975, so when the letter (and possibly tape) were placed in the phone booth is an important factor. If the letter was placed there in the minutes after the crime (or Sunday night) and not discovered until Monday morning, the greater the possibility that the letter was written by the murderer of Anthony Vincent Bruno, who hadn't read or heard any reporting of the crime.
There are three main possibilities regarding the letter:  Somebody read or heard the details of the crime, noted the similarities to the Zodiac attacks, and decided to hoax a letter.  The person who murdered Anthony Vincent Bruno prepared a Zodiac-style letter to shift the emphasis away from the fact it was personal attack.  The person who committed the murder and wrote the letter was the Zodiac Killer, however unlikely this option may seem. The Zodiac Killer hadn't conclusively been linked to a murder for six years at this point, and hadn't written a confirmed letter for well over a year, which undoubtedly weakens the intent of a person attempting to shift the blame onto the Zodiac Killer. The last widely accepted letter from the Zodiac Killer was the Exorcist letter mailed on January 29th 1974, probably mailed from San Mateo County. If this was "truly" a Zodiac letter, it too would have a San Mateo connection.
Two and a half years later, a cryptic letter was mailed to the San Francisco Chronicle on July 19th 1978, in what can only be described as unintelligent ramblings. With respect to the 1975 letter (and possibly cassette tape) placed in the phone booth near the crime scene, a certain section of text in the July 19th 1978 was of particular interest. It may have no connection whatsoever to the Anthony Vincent Bruno murder, but read "I have my real name on a small metallic tape. You see, while you have it in your possession, I want you to know it belongs to me and you think I may have left it accidentally". Was this "small metallic tape", a ferric cassette tape, which was deliberately placed in the phone booth and was now in the possession of law enforcement? The murder of Anthony Vincent Bruno in San Mateo on November 2nd 1975 is a difficult crime to connect to the Bay Area murders of the Zodiac Killer without access to this letter (and tape), but the broken stock of the shotgun found ten feet from the murder scene could contain valuable evidence if stored correctly.
Thanks to Zodiac Killer Site forum.