Unmasking the Zodiac Killer: Paul Stine's Murder

Blood pooled beneath the driver’s seat of a yellow taxi idling at the intersection of Washington and Cherry Streets in San Francisco’s wealthy Presidio Heights neighborhood. The cab’s meter was still running. Its headlights illuminated the foggy October night. Within minutes, police would discover the body of Paul Stine, a 29-year-old cab driver shot once in the head at point-blank range. The killer had torn away a large piece of the blood-stained shirt to keep as a trophy. It was October 11, 1969, and San Francisco would never be the same.

Paul Stine had picked up his last fare near the theater district, blocks from the busy intersection of Mason and Geary. Stine, a former student at San Francisco State College, had been driving for the Yellow Cab Company to help pay his tuition. He was known for his reliability, and his friends said he was careful about who he picked up at night.

On the evening of the murder, Stine was called to pick up a passenger in downtown San Francisco. The fare requested a ride to Presidio Heights, an upscale neighborhood filled with Victorian homes and tree-lined avenues. The destination stood out: Cherry Street, a block from the Presidio military base, a place almost entirely residential and rarely frequented by taxi drivers.

At 9:55 p.m., a neighbor heard the gunshot. Several teenagers, looking through an upstairs window at 3899 Washington Street, saw a man reach into the cab, wipe down the front and back doors, and calmly walk away, tearing a piece of Stine’s shirt as he did. The killer was described as a white male, around 35 to 45 years old, stocky, with reddish-brown hair and heavy-rimmed glasses.

Police were dispatched after a call at 9:58 p.m.; the report, due to a clerical error, was mischaracterized as an assault on a black man. Officers responding to the scene stopped and questioned a white man walking calmly away from Cherry Street, but let him go. Only later would they realize this was likely the Zodiac Killer himself.

Just nine months earlier, Northern California had been shocked by a series of violent attacks on young couples parked in isolated lovers’ lanes. The first took place on December 20, 1968, when high school students David Faraday and Betty Lou Jensen were shot and killed on Lake Herman Road near Benicia. Faraday was 17; Jensen was 16. They were parked in Faraday's mother’s Rambler, planning to attend a Christmas concert. Both were shot at close range with a .22-caliber weapon. Jensen fled from the car and was shot five times in the back, dying instantly. Faraday was shot once behind the left ear.

Seven months later, on July 4, 1969, Darlene Ferrin and Michael Mageau were parked at Blue Rock Springs Park in Vallejo, only a few miles from the first murder scene. Darlene Ferrin, 22, was a waitress and young mother, well-liked by friends and co-workers. Michael Mageau, 19, was her friend and occasional companion. At about midnight, a car rolled up behind them. A man approached, shined a flashlight in their faces, and opened fire with a 9mm Luger. Ferrin was struck multiple times and died at the hospital. Mageau survived, despite being shot in the face, neck, and chest.

After Ferrin’s murder, at 12:40 a.m., a man called the Vallejo Police Department from a payphone only blocks away. He spoke in a flat, almost detached voice, stating: “I want to report a double murder. If you will go one mile east… you will find kids in a brown car. They were shot with a 9mm Luger. I also killed those kids last year. Goodbye.” The call was traced to a phone booth in front of a gas station at the corner of Springs Road and Tuolumne Street.

On August 1, 1969, three Bay Area newspapers—the Vallejo Times-Herald, the San Francisco Chronicle, and The San Francisco Examiner—each received a letter. Each letter was written in block capitals, with many misspellings, and included one-third of a 408-symbol cryptogram. The sender demanded the ciphers be printed on the front page, threatening to “cruse around all weekend killing lone people in the night then move on to kill again, until I end up with a dozen people over the weekend.” The signature at the bottom was a simple circle with a cross through it.

The ciphers were a jumble of letters and symbols. Amateur codebreakers Donald and Bettye Harden, a high school teacher and his wife from Salinas, managed to solve the first one within a week. The plaintext opened: “I LIKE KILLING PEOPLE BECAUSE IT IS SO MUCH FUN.” The killer claimed murder was “even better than getting your rocks off with a girl.” Despite his claims, the letter gave no concrete clues to his identity, only ranting about his need to collect “slaves for the afterlife.”

On September 27, 1969, Bryan Hartnell and Cecelia Shepard drove to Lake Berryessa, northeast of Napa. The couple, both college students, relaxed by the shore’s edge on a warm afternoon. At around 6:30 p.m., a man approached wearing a black executioner’s hood, clip-on sunglasses, and a bib emblazoned with a white cross-circle symbol. He held a gun and a knife. He told them he was an escaped convict and needed their car and money. Hartnell complied, and the man tied both up with plastic clothesline. Suddenly, the masked figure stabbed both victims repeatedly—ten times for Shepard, six for Hartnell. Before leaving, he drew the cross-circle sign and wrote “by knife” on Hartnell’s car door, listing the dates of his previous attacks.

A fisherman found the couple and summoned help. Shepard died two days later at the hospital. Hartnell survived, providing the police with a description of the perpetrator and the bizarre costume.

Two weeks after Lake Berryessa, the Zodiac’s violence escalated. On October 11, 1969, Paul Stine picked up his final fare at the corner of Mason and Geary Streets. The passenger asked to be driven north to Presidio Heights. At the intersection of Washington and Cherry, the man shot Stine in the head, wiped down the car, and took a piece of the cabbie’s shirt as a grisly souvenir. Three teenagers witnessed the aftermath, describing the suspect to police.

The killer sent the bloody scrap of Stine’s shirt to the San Francisco Chronicle, along with a letter taking credit for the murder and threatening to “wipe out a school bus some morning.” The Zodiac taunted police, writing, “School children make nice targets.” This letter triggered panic among Bay Area parents and prompted police escorts for buses.

The investigation intensified as law enforcement agencies from multiple jurisdictions scrambled to coordinate. San Francisco Police Department Inspector David Toschi became one of the most prominent investigators on the case, joined by Inspector Bill Armstrong and Vallejo Police Detective Ed Rust. The FBI was brought in after the murder of Paul Stine, given the interstate nature of the case and the Zodiac’s threats against schoolchildren.

Evidence collected from the Stine crime scene included bloody fingerprints found on the taxi’s door and a partial palm print. The torn shirt fragment provided a direct, physical link between the killer and his crime. However, the print did not match anyone in police records. Witnesses’ descriptions were consistent with earlier reports, but the Zodiac’s identity remained elusive.

Each new letter from the Zodiac brought fresh clues and new frustrations. Letters were filled with deliberate misspellings, such as “victom” for “victim” and “paradice” for “paradise.” Law enforcement suspected the errors were intentional, designed to mislead or disguise the killer’s level of education.

On November 8, 1969, the Chronicle received another cryptic letter—a 340-character cipher known as the “Z340.” For over fifty years, this cipher stumped experts. It was finally solved in December 2020 by an international team of codebreakers. The decrypted message read, in part: “I hope you are having lots of fun in trying to catch me… I am not afraid of the gas chamber…” The cipher, though taunting, gave no clue to the killer’s name or motive.

The Zodiac’s letters continued sporadically until 1974. In what would become his final confirmed correspondence, he reviewed the horror film “The Exorcist” and claimed he had killed 37 people. No evidence has ever been found to link the Zodiac to more than seven confirmed victims.

Throughout the investigation, police received thousands of tips and chased hundreds of leads. Arthur Leigh Allen, a former elementary school teacher and convicted sex offender, became the primary suspect. Allen lived in Vallejo, close to the sites of the first two attacks. He owned a typewriter capable of producing the distinctive letters seen in the Zodiac’s notes and had told friends he would like to call himself “the Zodiac.” A search of his home found a Zodiac watch and books on ciphers, but no physical evidence directly tying him to the murders.

Handwriting experts compared Allen’s script with the Zodiac’s, but the results were inconclusive. Allen’s fingerprints did not match those found in Paul Stine’s cab. In 1992, Allen died of a heart attack. DNA testing conducted decades later on stamps and envelopes from Zodiac letters did not match Allen’s DNA, though questions remain over chain of custody and contamination.

Other suspects included newspaper cartoonist Robert Graysmith, who became obsessed with the case, and Rick Marshall, a reclusive projectionist. Yet, no conclusive evidence has ever linked any suspect to the Zodiac crimes.

The case is still open. The San Francisco Police Department, the FBI, and local law enforcement agencies continue to review evidence and follow up on new leads. Advances in DNA analysis and digital forensics have not, so far, yielded a suspect’s name.

The Zodiac’s crimes brought sweeping changes to Northern California’s sense of safety. Couples were afraid to park in secluded spots. School buses were rerouted or delayed under police guard. Newspapers debated whether to publish the killer’s ciphers, torn between public safety and the risk of provoking the Zodiac. In Vallejo, Benicia, Napa, and San Francisco, an entire generation grew up in the shadow of a faceless killer whose taunting letters seemed to mock the efforts of police.

The Zodiac’s ciphers remain among the most famous unsolved codes in criminal history. Two of the four ciphers have been solved, including the Z340 in 2020, but the remaining two have never been decrypted. Codebreakers and amateur sleuths continue to search for hidden meanings and secret names.

The Zodiac’s methods were calculated to instill fear. He shifted murder weapons—using a .22-caliber pistol at Lake Herman Road, a 9mm Luger at Blue Rock Springs, and a knife at Lake Berryessa. He wore a distinctive costume during the Lake Berryessa attack: a black executioner’s hood and a chest panel bearing his cross-circle symbol. This level of theatricality was unique among American serial killers.

The Zodiac’s letters often referenced media coverage and police activity, indicating he tracked the investigation closely. He referred to himself as “the Zodiac” in his letters, a moniker he invented and reinforced with his signature cross-circle symbol.

The Zodiac’s attacks were mostly on young couples in cars, often in lovers’ lanes or isolated locations. According to former FBI profiler Gregg McCrary, this pattern might indicate resentment toward relationships, suggesting possible jealousy or envy. No evidence has ever surfaced to explain the Zodiac’s choice of victims or his motive.

The Zodiac’s letter on November 9, 1969, included a chilling threat: “School children make nice targets.” Police took this seriously, assigning escorts to bus routes in San Francisco and across the Bay Area. No school bus was ever attacked.

The Zodiac’s last confirmed letter came in 1974, five years after his known crimes began. In this note, he claimed responsibility for 37 murders, though only seven victims—five killed and two who survived—have been definitively linked to him. The true number of his victims remains unknown.

The killer’s ability to vanish after each attack baffled investigators. At Lake Berryessa, after stabbing Bryan Hartnell and Cecelia Shepard, he walked back across the lakeshore, out of sight. At Presidio Heights, he escaped on foot through a quiet residential neighborhood, despite the presence of witnesses and a police perimeter.

The Zodiac’s case remains one of the most enduring mysteries in American criminal history. Despite thousands of suspects and decades of investigation, his identity has never been confirmed. The FBI has stated that the investigation remains open and unsolved, with no definitive identification of the killer.

The Zodiac’s ciphers, especially the 408-symbol cipher and the Z340, have fascinated cryptographers worldwide. The Z340, solved in 2020, included no name, only more taunts and boasts.

The Zodiac’s taunting style influenced later criminals and sparked a media frenzy. His deliberate misspellings, cryptic codes, and macabre humor set him apart from other serial killers of the era.

The Zodiac’s crimes forced law enforcement agencies in Northern California to share information and work together more closely than ever before. The complexity of the case, spanning multiple counties and law enforcement jurisdictions, exposed weaknesses in communication and evidence sharing.

The killer’s manipulation of the press—demanding cryptograms be published, threatening further violence—blurred the lines between criminal investigation and public spectacle.

The Zodiac’s use of costume and symbols at Lake Berryessa—especially the black executioner’s hood and cross-circle insignia—introduced an element of theatricality and ritual to his violence, rarely seen in American criminal history.

The Zodiac’s use of a payphone to call the police after the Blue Rock Springs attack showed a willingness to taunt authorities directly, while also providing details only the killer could know.

The Zodiac left a handwritten message on Bryan Hartnell’s car door at Lake Berryessa, listing his past crimes by date and method, and signing with his symbol, a move designed to claim credit and reinforce his persona.

The Zodiac’s claim in his letters that he was “collecting slaves for the afterlife” suggested a bizarre, possibly delusional motive, though no evidence has ever surfaced to support this claim.

The Zodiac’s final confirmed letter, sent in 1974, referenced “The Exorcist,” a popular horror film released the year before, and concluded with a tally of 37 victims.

The Zodiac’s crimes remain unsolved, and the killer’s identity is still unknown.