Zodiac Killer: The Cryptic Letters and Murders

The mailroom at the *San Francisco Chronicle* was crowded on August 1, 1969. A thick envelope landed with the others, addressed in jagged, deliberate handwriting. Inside, staff found a letter beginning with: “I am the killer of the 2 teenagers last Christmass at Lake Herman & the girl last 4th of July.” The envelope also contained one-third of a cryptogram, a block of symbols and shapes that no one in the room could immediately decipher. That day, two other Bay Area newspapers each received nearly identical letters, each with its own piece of the cipher. The sender demanded front-page publication, threatening more violence if he was ignored.

This moment marked the public debut of a figure who would come to be known as the Zodiac Killer. The initial letters referenced two separate attacks—one near Lake Herman Road the previous December, and another in Vallejo less than a month before the letters arrived. Each letter was rife with misspellings and chilling in its specificity. The writer described shooting Michael Mageau and Darlene Ferrin, recalling details about the scene, down to the location and the number of shots fired. He claimed, “In this cipher is my idenity,” and warned, “If you do not print this cipher on your front page I will go on a kill rampage.” The threat was credible, and the newspapers published the ciphers.

Within days, a couple named Donald and Bettye Harden set to work on the puzzle. They cracked the 408-symbol cipher by guessing that the word “kill” would appear. The decrypted message contained an admission: “I like killing people because it is so much fun.” It referenced the killer’s desire to collect “slaves” for his afterlife, echoing language found in the killer’s ongoing correspondence. The cipher provided no name, only the promise of further violence.

By then, Northern California was already living in the shadow of fear. The first known murders attributed to the Zodiac Killer had taken place on December 20, 1968. Betty Lou Jensen and David Faraday, both local high school students, spent the evening together before parking on Lake Herman Road, a known lovers’ lane outside Benicia. Sometime between 11:05 and 11:10 p.m., another car pulled up alongside them. The driver emerged and fired several shots, forcing the teenagers to scramble from their car. David Faraday was shot in the head at close range. Betty Lou Jensen ran, but the killer pursued her, firing five more times. She collapsed, dead on the spot. Faraday died at the hospital.

The killer left no physical evidence—no usable prints, no shell casings that could be traced, no witnesses. Local police had almost nothing to go on. News of the brutality spread quickly, but as winter turned to spring and then summer, the case grew cold.

On July 4, 1969, barely six months later, the killer struck again, this time at Blue Rock Springs Park in Vallejo, just two miles from the site of the first attack. Darlene Ferrin and Michael Mageau parked their car in the lot late at night. A second car arrived, left, then returned minutes later. The driver exited, approached Mageau’s side, and shone a flashlight into the vehicle. Hoping it was a police officer, Mageau rolled down his window. Without a word, the stranger pulled a 9mm pistol and fired multiple times into the car. Ferrin was hit in the neck; Mageau in the arm and jaw. The assailant left, then returned to fire again before vanishing into the night.

A caretaker at a nearby golf course heard the shots. Three teenagers discovered the wounded couple and drove for help. Ferrin was pronounced dead at the hospital. Mageau survived, his wounds severe, but he was able to give police a description: a heavyset white man, about 5’8”, curly light brown hair, wearing dark clothes. Twenty minutes after the attack, the Vallejo Police Department received a phone call from a pay phone just two blocks from their station. The caller stated, “I want to report a double murder. If you go one mile east on Columbus Parkway you will find kids in a brown car. They were shot with a 9-millimeter Luger. I also killed those kids last year. Goodbye.” The voice was calm, almost emotionless.

The letter-writing campaign intensified police scrutiny and public anxiety, but the killings did not stop. The next attack was unlike anything law enforcement had seen before. On September 27, 1969, Bryan Hartnell and Cecelia Shepard, both college students, were relaxing by Lake Berryessa in Napa County. Cecelia noticed a man watching them from behind a tree. He wore a black executioner’s hood, clip-on sunglasses over the eye holes, and a bib with a white cross-circle symbol. He carried a gun and a knife.

The man told the couple he was an escaped convict and needed their car and money. Under threat, Cecelia tied up Bryan with plastic clothesline, but her knots were too loose. The attacker retied them, then bound Cecelia. Suddenly, he drew a long-bladed knife and stabbed Bryan six times and Cecelia ten. He left them bleeding on the ground, walked back to their car, and wrote on the door with a felt-tip pen: “Vallejo 12-20-68 7-4-69 Sept 27–69–6:30 by knife,” and drew the cross-circle symbol. He then drove 27 miles to downtown Napa, called the police from a payphone, and confessed: “I wish to report a murder—no, a double murder.” He did not hang up the phone.

A fisherman and his son heard screams and sought help. When police arrived, Bryan was conscious, and Cecelia slipped into a coma on the way to the hospital. She died two days later; Bryan survived and described every chilling detail to investigators.

Just two weeks later, on October 11, 1969, the killer resurfaced on the crowded streets of San Francisco. Paul Stine, a cab driver, picked up a fare near Union Square. The passenger directed him to Presidio Heights. At the corner of Washington and Cherry, the man shot Stine in the head, took his wallet and keys, and tore off a piece of the shirt. Three teenagers saw the entire scene from a house across the street—enough to give police a detailed description. They watched the killer walk away, wiping down the vehicle. Police were dispatched to look for a black male suspect due to a dispatcher’s error. Patrol officers passed a white man in dark clothing nearby, who claimed he saw someone running with a gun. That man may have been the killer himself.

Within days, the *San Francisco Chronicle* received another letter from the Zodiac. Enclosed was a blood-stained swatch of Paul Stine’s shirt. The letter boasted about the murder and threatened to “shoot out the tire of a school bus and pick off the kiddies as they come bouncing out.” The threat set off a wave of panic. The letter included boasts about outwitting the police and described details of his escape.

Each survivor’s testimony became a critical thread in the investigation. Michael Mageau, still hospitalized with his wounds, described his attacker to detectives. He remembered the shape of the man’s face, the color of his hair, and the deep, calm voice. His account prompted the first composite sketches, but the evidence was too general to yield a suspect. Bryan Hartnell, traumatized but clear-minded, described the Zodiac’s costume in detail: the black hood, the white symbol, the cold deliberation with which the attacker tied knots and wielded his knife. Hartnell’s memory helped police reconstruct the sequence of events and create a composite image. Cecelia Shepard, just before losing consciousness, also gave police a description that matched Hartnell’s. Both survivors described a man roughly six feet tall and 200 pounds.

These first-hand accounts were subjected to intense scrutiny. Police showed sketches to witnesses who had been at Lake Berryessa earlier that day. A dentist and his son, as well as three women sunbathing nearby, reported seeing a heavyset man loitering and watching people from behind trees. Law enforcement worked with a photographer to develop a composite sketch using an Identi-Kit. The timeline of the day, combined with these sketches, helped confirm the killer’s presence and movements.

Paul Stine’s murder produced the strongest forensic evidence. The killer left behind two partial fingerprints on the cab. Police canvassed Presidio Heights, searching the area and questioning potential witnesses. Detectives Bill Armstrong and Dave Toschi of the San Francisco Police Department took on the case, filling whole filing cabinets with suspects and research. But the prints did not match anyone in the database, and the composite sketches did not lead to a positive identification.

From the first murders, the police investigation was hamstrung by a startling lack of physical evidence. The Lake Herman Road attack left no fingerprints, no footprints, and no shell casings that could be traced to a suspect. At Blue Rock Springs, investigators found no usable evidence at the scene, and the killer’s phone call, made from a public payphone, left no clues except for the chilling confession itself. The Lake Berryessa attack yielded footprints, the killer’s writing on Hartnell’s car, and a palm print from the payphone, but none matched any known suspect.

Reporting on the Zodiac case dominated headlines after each crime and letter. The killer seemed to read the coverage, and he escalated his behavior in response. The police and newspapers started receiving more letters, each filled with elaborate threats and new ciphers. In November 1969, the Zodiac mailed a card with a 340-character cryptogram to the *Chronicle*, which would remain unsolved for 51 years. The killer included diagrams of bombs he claimed he would use to blow up school buses. In December, another letter arrived, addressed to celebrity attorney Melvin Belli, with a piece of Paul Stine’s shirt attached. The tone was different—desperate and erratic: “Please help me I am drownding… I cannot remain in control for much longer.”

Even as police coordinated efforts across jurisdictions—including the San Francisco Police Department, Vallejo Police Department, and Napa County Sheriff’s Office—the killer stayed ahead. Detectives scoured hundreds of leads and interviewed dozens of suspects. Every fragment of handwriting, every detail from the ciphers, every eyewitness account was analyzed by hand and by the earliest computer forensics available. The FBI and the CIA both tried to crack the ciphers.

The letters kept coming. In April 1970, the Zodiac sent a letter with a 13-character cipher and wrote, “My name is”—but the message has never been satisfactorily decoded. In June, he sent a letter containing a Bay Area map marked with a symbol at Mount Diablo, including a 32-character cipher that he claimed would reveal the location of a bomb. This cipher remains unsolved, and no bomb was found. The killer repeatedly complained that no one was wearing Zodiac-themed buttons, issuing threats when he was ignored.

Letters in July and October 1970 included more boasts and threats and were often signed with the cross-circle symbol. In October, the *Chronicle* received a "Halloween" card addressed to reporter Paul Avery with a handwritten note: “Peek-a-boo, you are doomed.” The tone was playful and taunting, pushing at the growing tension and fear among both police and the public.

In March 1971, a letter arrived at the *Los Angeles Times*, in which the Zodiac suggested he had moved to Southern California and claimed 17 victims. The infamous "Exorcist" letter, postmarked January 29, 1974, marked the last widely accepted communication from the Zodiac Killer. In it, he referenced the horror film and claimed his total victim count had reached 37.

All told, the Zodiac Killer is definitively linked to five murders and two attempted murders—David Faraday, Betty Lou Jensen, Darlene Ferrin, Cecelia Shepard, and Paul Stine lost their lives. Michael Mageau and Bryan Hartnell survived, providing vital witness accounts. In his letters, the Zodiac claimed responsibility for as many as 37 murders, but only these five have been conclusively tied to him by investigators. Over five decades, dozens of other unsolved cases have been scrutinized for possible links, but none have been definitively matched.

Despite decades of investigation, the Zodiac Killer’s identity remains unknown. Law enforcement agencies, including the FBI and multiple local police departments, have kept the case open, and new leads are reviewed as they emerge. The ciphers, partial fingerprints, survivor descriptions, and taunting letters have all been pored over by professional investigators and amateur sleuths around the world. In 2020, a team of private citizens finally solved the 340-character cipher using custom software, revealing another message about the killer’s worldview but offering no name or concrete clue to his identity.

The Zodiac case remains one of the most famous unsolved serial murder investigations in American history. The killer’s crimes and his campaign of communication inspired widespread speculation, books, films, and ongoing research. The five confirmed murders—brutal, random, and chilling in their execution—left Northern California changed forever. The last widely accepted Zodiac letter, postmarked in January 1974, claimed a final score: “Me = 37, SFPD = 0.”