The Zodiac Killer: Letters from a Madman

A blood-soaked taxi driver slumped behind the wheel in San Francisco’s upscale Presidio Heights neighborhood. His killer had vanished, but not before calmly wiping down the vehicle and tearing away a piece of the victim’s shirt as a trophy. It was October 11, 1969. The killer was not done. He would soon mail that swatch of fabric, along with a letter, to one of the city’s major newspapers—taunting the police and guaranteeing that the name “Zodiac” would haunt American true-crime history for decades.

Paul Lee Stine was a 29-year-old cab driver, working the night shift to pay his way through graduate school. He lived in San Francisco, his life marked by the routines and risks that came with driving a taxi at odd hours. On that October night, Paul picked up a fare at the intersection of Mason and Geary Streets—a white male, estimated between 25 and 30 years old, about five-foot-eight to five-foot-ten, stocky build, with brown hair in a crew cut. The destination was the intersection of Washington and Maple Streets, an affluent spot in Presidio Heights.

Meanwhile, the city and the surrounding region were already on edge. In the previous year, Northern California had been terrorized by a string of brutal attacks. On December 20, 1968, high school students David Arthur Faraday and Betty Lou Jensen were shot and killed on a lonely stretch of Lake Herman Road in Benicia. Just six months later, Michael Mageau and Darlene Ferrin were attacked in their parked car in Vallejo; Mageau survived, but Ferrin did not. With each new murder, the sense of fear in the Bay Area deepened, made worse by the killer’s habit of mailing letters and cryptograms to local newspapers—letters that boasted about the crimes and threatened more.

Bryan Calvin Hartnell and Cecelia Ann Shepard, both college students, were attacked on September 27, 1969, at Lake Berryessa. The assailant wore a black executioner’s hood, a cross-circle symbol on his chest, and carried a knife. Hartnell survived after being stabbed six times; Shepard died two days later. The attacker left a message on Hartnell’s car door in black marker: the dates of the previous murders, the location, and the symbol. The killer’s pattern was changing, but his need for attention and control was growing.

On the night of October 11, 1969, Paul Stine picked up his passenger, unaware of the danger. The cab drove through the city, but instead of stopping at Maple Street, the passenger told Stine to continue one block further, to Washington and Cherry. There, in the darkness, the killer shot Stine in the head with a 9mm handgun. Three teenagers in an upstairs window across the street saw the aftermath: a man wiping the cab’s interior and tearing away a piece of Stine’s bloodied shirt. They dialed the police, giving a detailed description of the suspect.

The killer walked away from the scene, heading north on Cherry Street, and disappeared into the Presidio—a military base and parkland thick with trees, crisscrossed by trails. Responding officers received a radio bulletin describing the suspect as a Black male, due to a mistake made in relaying the teenagers’ description. As a result, police briefly stopped a white man walking nearby, but let him go when he did not match the incorrect description. Unbeknownst to them, they had likely come face to face with the Zodiac Killer.

Within days, the San Francisco Chronicle received a letter from the Zodiac. Enclosed was a torn piece of Paul Stine’s bloody shirt as proof of the killer’s authenticity. The letter mocked the police for failing to capture him and threatened to “wipe out a school bus some morning.” The letter’s tone was taunting, its content specific—details only the killer could know.

The Stine murder was different from the Zodiac’s earlier attacks. For the first time, the killer had struck in the city, targeting an adult rather than a young couple. The killing was committed in a densely populated neighborhood, with witnesses close by. The Zodiac’s pattern was unpredictable—he had shot, stabbed, and now executed a man for unknown reasons.

The investigation drew in officers from the San Francisco Police Department, the Vallejo Police Department, the Napa County Sheriff’s Department, and the FBI. Inspector Dave Toschi and Inspector Bill Armstrong led the SFPD inquiry. They canvassed the neighborhood, interviewed witnesses, and collected forensic evidence—including fingerprints found on the taxi’s doors and a partial bloody palm print from the divider between the front and back seats.

The three teenage witnesses provided a detailed description of the suspect, which was used to create composite sketches. The suspect was described as a white male, around 35 to 45 years old, with a stocky build, reddish-brown crew cut, and glasses. The composite sketch would become one of the most circulated images in California law enforcement in the years to come.

Meanwhile, the Zodiac continued to communicate. On November 8, 1969, the San Francisco Chronicle received a card containing a new cryptogram—the so-called “340-character cipher.” The card also bore the Zodiac’s symbol: a cross within a circle. The cipher would remain unsolved for over fifty years, despite efforts by professional and amateur cryptographers around the world. When cracked in 2020, the message revealed more taunts about the police and claims that the Zodiac was not afraid of the gas chamber, but it did not give his name.

The Zodiac’s letters increased public panic. In his next letter, sent on November 9, 1969, he claimed responsibility for the Stine murder and provided additional details. He included another scrap of the bloodstained shirt, further proving his authorship. He threatened to attack children, describing how he could shoot out the tires of a school bus and “pick off the kiddies as they come bouncing out.” This chilling threat led police to assign patrol cars to escort school buses in San Francisco for months.

Police examined the crime scene extensively. They dusted the taxi for fingerprints, collected hair samples, and analyzed the ballistics from the 9mm Luger cartridge found at the scene. The bullet matched no known weapon in law enforcement databases. The fingerprints found on the taxi door were smudged and incomplete, but were circulated to agencies across the country.

Investigators considered dozens of suspects, but every lead seemed to dissolve under scrutiny. The Zodiac’s letters showed a detailed knowledge of police procedures, local geography, and even the details of the investigation itself. The killer referenced specific radio broadcasts and newspaper articles, demonstrating that he was actively monitoring the response to his crimes.

The pattern of the Zodiac’s attacks was hard to predict. His first confirmed murders, on December 20, 1968, targeted two teenagers—David Faraday and Betty Lou Jensen—who were shot at close range while parked on Lake Herman Road. The killer’s next attack, on July 4, 1969, targeted Michael Mageau and Darlene Ferrin in Vallejo. Mageau survived despite being shot in the face and neck; Ferrin died of her wounds. The killer called the Vallejo Police Department from a payphone less than an hour later, confessing to the shooting and providing directions to the scene.

On September 27, 1969, the Zodiac chose a new method, ambushing Bryan Hartnell and Cecelia Shepard at Lake Berryessa. Wearing a handmade black costume with a bib displaying the cross-circle symbol, the attacker tied up the couple and stabbed them repeatedly. Hartnell survived, but Shepard died from her injuries. The killer marked the couple’s car with the dates of his previous crimes, as well as the time, location, and symbol.

After the Stine murder, the Zodiac’s communications became more frequent and theatrical. On December 20, 1969, he sent a letter claiming responsibility for the murder of a woman in August of that year, though police could not verify the claim. On March 22, 1970, Kathleen Johns reported being abducted by a man near Modesto, California, who said he would help her with her car, then drove her and her infant daughter around for hours before she escaped. The Zodiac later claimed responsibility for this incident in a letter.

The volume and style of the Zodiac’s letters varied. On July 24, 1970, he sent a letter to the San Francisco Chronicle, this time including a map with a cross-circle symbol marking Mount Diablo and a new cryptogram of 32 symbols. On October 27, 1970, the killer sent a Halloween card to Chronicle reporter Paul Avery, featuring a macabre poem and another drawing of his symbol.

The investigation drew on crime labs and experts from across California. The cryptograms were published in local papers, allowing amateur codebreakers to join in. The first cipher, a 408-symbol puzzle split among three newspapers, was solved by a high school teacher and his wife within a week. The decoded message was a disturbing, rambling confession, but it did not reveal the killer’s identity.

Law enforcement agencies compiled massive case files, following up on hundreds of tips and possible connections to other unsolved murders. Gregg McCrary, a former FBI profiler who studied the Zodiac case, later said, “The killer constantly changed his method of operating and openly admitted that murder was sport for him.” This changing modus operandi made it nearly impossible to predict his next move, or reliably connect him to other crimes.

In trying to profile the killer, investigators noted distinctive elements: the careful staging at Lake Berryessa, the use of ciphers and codes, the collecting of trophies, and the blending of criminality with a need for publicity. The Zodiac seemed to crave attention as much as violence. He threatened to kill randomly, to shoot out the tires of a school bus, to bomb buildings, and to reveal his name if his ciphers were solved. The killer’s ability to manipulate fear was nearly as dangerous as his attacks.

In November 1969, police came heartbreakingly close to catching the killer. After the Stine murder, officers stopped a man in the neighborhood who matched the description given by the teenage witnesses. Because the initial radio bulletin had described a Black suspect, the officers let the man go—only realizing their mistake later. This remains one of the most painful missed opportunities in the case.

Over the following months, the Zodiac’s letters became less frequent. On March 13, 1971, he wrote to the Los Angeles Times, claiming a recent murder as his work. The last confirmed Zodiac letter arrived on January 29, 1974, referencing the film “The Exorcist” and mocking the SFPD for not catching him. By then, the direct attacks had stopped, but the investigation remained active.

Over twenty letters were eventually attributed to the Zodiac. They contained cryptic messages, ciphers, taunts, and threats. Of the four main ciphers he sent, two have been solved. The most famous unsolved cipher, the 340-character puzzle, was finally cracked in 2020 by a team of amateur codebreakers led by David Oranchak, who described the resulting message as “more of the same attention-seeking junk from Zodiac.” The cipher did not reveal the killer’s name or identity.

The Zodiac’s case stretched police resources and tested their methods. The killer sent letters directly to the Vallejo Times-Herald, the San Francisco Chronicle, and the Examiner, splitting his cryptograms so that all three papers had to cooperate. This forced unprecedented coordination between the press and law enforcement and cemented the Zodiac’s hold on public attention.

The killings attributed to the Zodiac left at least five victims dead: David Arthur Faraday, Betty Lou Jensen, Darlene Elizabeth Ferrin, Cecelia Ann Shepard, and Paul Lee Stine. Two others, Michael Mageau and Bryan Hartnell, survived their encounters, providing crucial eyewitness testimony. Kathleen Johns claimed to have survived an abduction attempt, but her case remains unverified.

The evidence gathered—from fingerprints to ballistics to eyewitness accounts—never resulted in charges or a conviction. The composite sketches were circulated widely, but no arrest followed. Forensic evidence was limited by the standards of the time; DNA testing was not yet available. Many of the Zodiac’s taunting letters remain in police custody, along with the famous cryptograms and the swatches of Paul Stine’s shirt.

The Zodiac Killer was never identified or caught. The investigation spanned decades, inspiring countless theories, books, and films. Law enforcement agencies reviewed thousands of suspects, but none were definitively linked to all the confirmed crimes. The killer’s identity, true motives, and fate remain unknown.

The Zodiac case reveals the vulnerabilities of police work in the face of a methodical and unpredictable killer. It demonstrates how media coverage can both help and hinder criminal investigations—by publishing the killer’s letters, the newspapers brought crucial information to light, but also amplified the Zodiac’s threats and heightened public fear. The case forced police departments to coordinate across jurisdictions, share evidence, and refine their forensic methods.

The Zodiac’s manipulation of the media, police, and public consciousness set a new precedent for criminals seeking notoriety. His use of ciphers, codes, and costume marked him as one of the most theatrical killers in criminal history. He left a bloody, cryptic trail through Northern California, a trail that led all the way from a lovers’ lane in Benicia to a taxi cab stopped under a streetlight in Presidio Heights.

The white cross-circle symbol the Zodiac scrawled on his costume, his letters, and on the car door at Lake Berryessa remains instantly recognizable decades later. The bloody swatch of Paul Stine’s shirt—mailed to the San Francisco Chronicle as proof of the killer’s authorship—still sits in an evidence locker. The last known letter from the Zodiac, sent in 1974, referenced a horror film and arrived without warning, as if to remind investigators that he was still out there, watching.