The Zodiac Killer: Chilling Crimes in San Francisco

A bloodstained taxi idled at the intersection of Washington and Cherry Streets in San Francisco. The driver slumped forward, a bullet wound behind his right ear. The killer, calm and methodical, wiped down surfaces with a cloth, collected the driver’s wallet and keys, then removed a piece of the man’s bloodied shirt. He walked away into the cool October night, vanishing into the city. On October 11, 1969, Paul Stine became the Zodiac Killer’s final confirmed victim. The murder was swift, clinical, and brazen — perpetrated on a bustling city street, and followed in days by a letter to local newspapers that included a scrap of Stine’s shirt as proof.

Paul Stine was a 29-year-old graduate student driving a taxi to help pay for his education. He lived in San Francisco, renting a modest apartment in the city’s Mission District. Stine came from a working-class family in California’s Central Valley. He’d been married for four years, and friends described him as quiet, studious, and meticulous. He occasionally drove for Yellow Cab, usually at night, after spending his days on graduate work.

On the night of October 11, Stine picked up a fare in downtown San Francisco. The destination entered in his log read “Washington and Maple.” Just before 10 p.m., he drove his cab into the upscale neighborhood of Presidio Heights, pulling up at the corner of Washington and Cherry — one block west of the listed address. At precisely 9:55 p.m., three teenagers in the house across the street watched as a man leaned forward from the back seat and shot Stine once in the head. The murderer lingered inside the cab for nearly a minute, rifling through Stine’s pockets, then wiping down surfaces. He tore a piece of fabric from the victim’s shirt, stepped out, and calmly strode north on Cherry Street toward the Presidio park.

The killer was a white male, approximately 35–45 years old, about 5’8” to 5’10”, stocky, with short brown hair and glasses. These details came from the three teenage eyewitnesses, who phoned the police within seconds of the shooting. The teenagers described the man’s deliberate movements, his careful attention to the inside of the cab, and his unhurried exit from the scene. They watched him cross the intersection, then disappear into the darkness of the Presidio.

The first police officers arrived at 9:58 p.m. The responding patrol car had been mistakenly told to look for a Black suspect, based on a miscommunication in the dispatcher’s broadcast. This error would become a critical failure: two officers, Eric Zelms and Donald Fouke, encountered a man matching the true description walking east on Jackson Street, just three blocks from the crime scene. Believing he was a witness, not a suspect, they allowed him to go on his way. The officers did not stop or search him.

Paul Stine’s murder was the fourth confirmed killing in a string of attacks that had terrorized Northern California for almost a year. The first attack occurred on December 20, 1968, on a desolate stretch of Lake Herman Road near Benicia, California. On that night, 17-year-old David Faraday and 16-year-old Betty Lou Jensen drove out to a lovers’ lane in David’s mother’s station wagon. At around 11:15 p.m., a car pulled up beside them. The driver stepped out, approached the passenger side window, and fired a .22 caliber pistol into the car. Both teens attempted to flee. Faraday was shot in the head at close range near the rear wheel, his body found next to the car. Jensen, struck five times in the back, collapsed lifeless 28 feet away. Investigators found spent shell casings, shoe prints, and tire tracks, but no witnesses and no clear motive.

Seven months later, on July 4, 1969, a similar attack occurred at Blue Rock Springs Park in Vallejo, just four miles from the site of the first murders. Darlene Ferrin, 22, and Michael Mageau, 19, parked in Ferrin’s brown Corvair at 11:55 p.m. Another car pulled up alongside. The driver exited, wielding a 9mm Luger. He fired five shots into the vehicle, striking both occupants. Mageau survived four gunshot wounds; Ferrin died shortly after midnight. Less than an hour later, a call came in to the Vallejo Police Department. The man on the line spoke in a calm, flat voice: “I want to report a double murder. If you will go one mile east on Columbus Parkway to the public park, you will find the kids in a brown car. They were shot with a 9mm Luger. I also killed those kids last year. Goodbye.” The report traced the call to a payphone at the corner of Springs Road and Tuolumne, less than a mile from the Vallejo police station.

On August 1, 1969, three Bay Area newspapers — the Vallejo Times-Herald, the San Francisco Chronicle, and the San Francisco Examiner — received nearly identical letters. Each was handwritten in block capitals, demanding publication of a cryptogram. “I am the killer of the 2 teenagers last Christmas at Lake Herman,” the letters began. Each included a third of a cipher made up of 408 characters. The writer warned that if the cipher wasn’t printed on the front page, he would go on a killing spree. The three ciphers, when pieced together, formed a puzzle that was solved within a week by Donald and Bettye Harden, a high school teacher and his wife living in Salinas. The decoded message read, “I LIKE KILLING PEOPLE BECAUSE IT IS SO MUCH FUN.” The text included rambling comments on murder, power, and slaves for the afterlife, but it did not reveal the killer’s name.

The next attack took place on the afternoon of September 27, 1969, at Lake Berryessa, a popular recreation spot in Napa County, nearly 50 miles north of San Francisco. Bryan Hartnell, 20, and Cecelia Shepard, 22, had driven up from the Bay Area to spend the day picnicking along the lake’s shore. At 6:15 p.m., a man emerged from behind an oak tree, wearing a black hood with clip-on sunglasses and a bib-shaped chest piece marked with a white cross-circle symbol. He held a pistol and a knife. The man claimed he was an escaped convict from Deer Lodge, Montana, seeking money and a car to flee to Mexico. He ordered Hartnell to tie up Shepard, then bound Hartnell himself. Without warning, he stabbed both victims repeatedly — Hartnell six times in the back, Shepard ten times in the back and torso. After the assault, the attacker drew the cross-circle symbol and the dates of both previous murders on the door of Hartnell’s white Volkswagen Karmann Ghia, using a black felt-tip pen. The killer then walked away. Both victims were found by a fisherman who heard their cries. Hartnell survived; Shepard died in the hospital two days later.

While police and journalists tried to assemble the chronology and meaning of these attacks, the killer adopted a nickname. In an August 7, 1969 letter to the San Francisco Examiner, he wrote, “This is the Zodiac speaking.” The symbol he used, a cross within a circle, became his signature. The Zodiac’s next letter arrived on October 13, 1969, just two days after Paul Stine’s murder. Enclosed was a torn piece of Stine’s bloodstained shirt. The writer described the murder in detail, mocked the police for failing to apprehend him, and threatened to kill schoolchildren.

The San Francisco Police Department assigned its homicide detail to the case, with Inspector Dave Toschi and Inspector Bill Armstrong leading the investigation. They interviewed over 2,500 suspects in the following years. Early suspicion fell on Arthur Leigh Allen, a former elementary school teacher and convicted sex offender from Vallejo. Allen had been fired from his job in 1968 for inappropriate behavior with children. He was known to own a Zodiac-brand wristwatch bearing the same cross-circle symbol, lived in proximity to several attacks, and had told acquaintances he fantasized about committing violent crimes. Despite executing multiple search warrants and collecting handwriting samples, police never found physical evidence linking Allen to the murders. He died in 1992 without being charged.

Key evidence in the Stine case included fingerprints found on the cab’s front passenger door, a bloody partial print from the dashboard, and the eyewitness statements of the three teenagers who saw the killer. Police also relied on the testimony of officers Zelms and Fouke, who had briefly encountered the suspect on Jackson Street. The killer’s letters and ciphers became a central focus. On November 8, 1969, the Zodiac sent the “340 cipher,” a cryptogram composed of 340 characters. For 51 years, the cipher remained unsolved, despite efforts by cryptographers and amateurs worldwide. In 2020, a team of private citizens — David Oranchak, Sam Blake, and Jarl Van Eycke — finally cracked the code. The message read, “I hope you are having lots of fun in trying to catch me. That wasn’t me on the TV show...” The text did not reveal a name, motive, or further details about the killer’s identity.

After October 1969, the Zodiac continued to send taunting letters and postcards to San Francisco newspapers through 1974. The final confirmed Zodiac letter arrived in January 1974, reviewing the film “The Exorcist,” calling it “the best satirical comedy that [he] had ever seen.” The communications often included threats, cryptic references, and more samples of Stine’s shirt. Some letters claimed additional victims, but none have been definitively linked to the Zodiac’s hand.

The Zodiac’s method of operation varied with each attack. At Lake Herman Road and Blue Rock Springs, he used a firearm, attacking young couples in parked cars at night. At Lake Berryessa, he switched to a knife and donned a theatrical costume, targeting a couple during the day in a public area. In San Francisco, he killed a taxi driver with a single gunshot in a residential neighborhood. Profilers noted, “The killer constantly changed his method of operating and openly admitted that murder was sport for him.” This irregularity stymied police efforts to connect the crimes through ballistic and behavioral evidence.

Despite the scale and intensity of the investigation — at least 2,500 suspects questioned, evidence collected from four counties, and nationwide media coverage — no one has ever been charged. The Federal Bureau of Investigation maintains an open case file. As of 2024, “The Zodiac Killer case remains open and unsolved. No one has ever been arrested, charged, or convicted for the series of murders in Northern California between 1968 and 1969.”

The Zodiac’s ciphers became a phenomenon in their own right. The first cipher, the 408-character puzzle, was broken in less than a week by the Hardens. The second, known as the “340,” resisted solution for over five decades. In 2020, the solution was published in a peer-reviewed journal: the Zodiac claimed he was not the man interviewed on a local TV show and denied seeking attention through media appearances. The cipher ended with a cryptic taunt that offered no clues to his identity.

The Zodiac’s costume at Lake Berryessa was unique among American serial killers. He appeared in broad daylight, clad in a homemade black hood, clip-on sunglasses, and a bib-like chest piece sewn with his cross-circle emblem. The killer carried pre-cut lengths of plastic clothesline to bind his victims. The effort to create and wear this disguise indicated careful planning and a desire to inspire fear and confusion.

After the Blue Rock Springs Park attack, the killer used a nearby payphone to call police within 40 minutes of the shooting. The phone was located just blocks from the Vallejo Police Department headquarters. The killer’s tone was calm, unhurried, and matter-of-fact. He claimed both the Ferrin–Mageau shooting and the previous Lake Herman Road murders. His voice was described as young, monotone, and without discernible accent by the officer who took the report.

At Lake Berryessa, the killer took the unusual step of leaving a written message on Bryan Hartnell’s car door. Using a black marker, he drew the cross-circle symbol and recorded the dates and locations of his previous attacks, signing the note “by knife.” This was the only time the killer explicitly claimed his method on the victims’ belongings at the scene.

Forensic evidence in all four confirmed murder scenes failed to provide a clear match. The bloody partial fingerprint in Stine’s taxi was too incomplete for positive identification. The shell casings at Lake Herman Road and Blue Rock Springs suggested a semiautomatic weapon, but no ballistic match was ever established with a known suspect’s firearm. Handwriting analysis compared the Zodiac’s letters to samples from several suspects, most notably Arthur Leigh Allen, but the results were inconclusive or contradictory.

The investigation spanned four police jurisdictions — Benicia, Vallejo, Napa County, and San Francisco — each with its own detectives, protocols, and recordkeeping. The Zodiac exploited these jurisdictional boundaries, shifting his crimes between counties and urban and rural locations. The killer’s letters demonstrated detailed knowledge of police procedures and newspaper deadlines.

The Zodiac claimed in his letters to have murdered as many as 37 people. Only five murders and two attempted murders have been conclusively attributed to him. Law enforcement agencies have investigated more than 2,500 possible suspects, but none has ever been charged, let alone convicted.

In November 1969, a school bus driver in San Francisco discovered a letter from the Zodiac threatening to shoot children as they exited school buses. Police responded by stationing patrol cars behind school buses and sending plainclothes officers to ride along routes for weeks.

The Zodiac’s final confirmed letter, received in 1974, included a review of “The Exorcist,” a film released the previous year. The killer mocked the movie, calling it “the best satirical comedy that [he] had ever seen,” and signed the letter with his cross-circle symbol and the number 37, implying his claimed body count.

The Zodiac case remains one of the most widely known unsolved serial killer cases in American history. The longevity of public fascination is due in part to the killer’s cryptic communications and the enduring mystery of his identity. The first Zodiac cipher was solved within a week, while the 340-character cipher was solved after 51 years.

The killer’s use of a signature symbol — the cross within a circle — is unique among American serial murderers. He included this symbol in nearly every letter, on the Lake Berryessa costume, and in messages left at the scene.

The only suspect ever publicly named by authorities was Arthur Leigh Allen. Despite circumstantial evidence, searches of Allen’s trailer and interviews with friends and family produced no physical evidence linking him to the crimes.

The only physical artifact connecting the Zodiac’s letters to the murders was the piece of Paul Stine’s bloodstained shirt, sent to the San Francisco Chronicle as proof that the author was indeed the killer.

More than five decades after the last confirmed murder, the Zodiac’s identity remains unknown. The case file contains thousands of pages, hundreds of pieces of physical evidence, and more than 2,500 investigated suspects.

At Lake Berryessa, the killer used a pre-written script, telling Hartnell and Shepard that he was an escapee from Deer Lodge Prison in Montana, an institution that at the time did not report any escapes.

The unsolved 340 cipher, mailed on November 8, 1969, was finally solved in 2020 by David Oranchak, Sam Blake, and Jarl Van Eycke, who used a combination of manual cryptanalysis and custom software to decode the message.

In the Stine murder, San Francisco police were given a description of the suspect as a Black male, due to a dispatcher’s error. As a result, officers on patrol did not stop or question a white male matching the actual eyewitness description.

The Zodiac’s last confirmed communication in 1974 marked the end of his taunting letters. Law enforcement and amateur investigators continue to debate the authenticity of letters received after that date.

The killer’s methodical approach, willingness to correspond with the press, and ability to evade capture despite multiple witnesses and physical evidence have kept the Zodiac’s crimes among the most chilling and confounding in American criminal history.