Zodiac Killer: Secrets of Lake Berryessa

A black executioner’s hood, drawn over the face of a man standing on the shore of Lake Berryessa, conceals not just his identity but his intent. In his hands, a knife glints in the afternoon sun. The man towers over a terrified couple, his voice distorted behind the mask as he orders them to lie face down. He draws a cross-circle symbol on his chest, marking himself as someone who has come to kill — and to announce it to the world.

David Faraday was 17. He was a high school senior, a friendly boy from Benicia, California, with ambitions that stretched beyond his small town. Betty Lou Jensen was 16. She loved art, spent time with friends, and wrote in her diary about the excitement of young love. On December 20, 1968, they arranged to meet for a date, driving out to Lake Herman Road, a quiet stretch just north of Vallejo. This was a favorite spot for teenagers looking for privacy.

It was a Friday night when David and Betty Lou parked along the gravel pullout. Reports would later say the night was cold and moonless. Around 11 p.m., another car pulled up beside them. At least five shots shattered the silence. Both teenagers were found dead: David, shot once in the head at close range; Betty Lou, shot five times in the back as she tried to run. Investigators found tire tracks and footprints, but there were no witnesses, no immediate suspects, and no apparent motive. Their families woke to a nightmare that would only deepen.

Six months later, on July 4, 1969, Darlene Ferrin, a 22-year-old waitress, was at Blue Rock Springs Park in Vallejo. She had driven there with 19-year-old Michael Mageau, a friend. It was nearly midnight when a car pulled up beside theirs. The driver left, then returned, parking behind them. A man emerged, blinding them with a flashlight, and fired five shots through the window. Darlene was struck multiple times and died later at the hospital. Michael survived, despite being shot in the jaw, neck, and shoulder. He described the shooter as a stocky man, possibly in his late 20s to early 30s, with short, light brown curly hair.

Within an hour, the Vallejo Police Department received a call from a payphone. The voice on the line was calm. The caller claimed responsibility not just for the attack that night but for the Lake Herman Road murders. He gave directions to the scene. The police traced the call to a phone booth just blocks from the department, suggesting the killer was confident enough to taunt them in person.

Three weeks after the Blue Rock Springs shooting, on August 1, 1969, three major newspapers — the Vallejo Times-Herald, the San Francisco Chronicle, and the San Francisco Examiner — each received a letter. Each letter was nearly identical, and each contained a third of a cryptogram: a 408-symbol puzzle. The killer demanded that the ciphers be printed on the front page. He threatened to kill more people over the weekend if his demands weren’t met. Each letter began with the same claim: “I am the killer of the 2 teenagers last Christmas at Lake Herman.”

The newspapers published the ciphers. Readers across California tried to solve them. On August 8, 1969, Donald and Bettye Harden, a schoolteacher and his wife in Salinas, cracked the code. The hidden message claimed the killer was collecting “slaves for the afterlife.” It ended with a taunt: “I will not give you my name.”

On September 27, 1969, Bryan Hartnell and Cecelia Shepard, both college students, drove to Lake Berryessa, a remote spot northeast of Napa. They spread a blanket on the grass by the lake. Around 6:30 p.m., a man approached them, wearing a black hood with a white cross-circle symbol on his chest. He told them he was an escaped convict and needed their car and money to get to Mexico. He tied them up with plastic clothesline, then drew a knife and stabbed them repeatedly. Bryan was stabbed six times; Cecelia, ten. The man then walked up to their car and drew his symbol on the door, writing, “Vallejo/12-20-68/7-4-69/Sept 27–69–6:30/by knife.”

Cecelia would die two days later in the hospital. Bryan survived, giving a detailed description of the attacker’s costume, voice, and behavior. About an hour after the attack, the Napa police received a call from a payphone just blocks from the station. The caller confessed: “I want to report a murder—no, a double murder.” He told them where to find the victims.

October 11, 1969. Paul Stine, a 29-year-old cab driver, picked up a fare in San Francisco’s theater district. The passenger directed him to the upscale neighborhood of Presidio Heights. At the intersection of Washington and Cherry Streets, the man shot Stine in the head with a 9mm handgun. He then rifled through Stine’s pockets, tore off a piece of the cabdriver’s shirt, and calmly walked away, wiping down the car as he left. Three teenagers witnessed the killer from a nearby window. Police arrived within minutes, but the killer had vanished into the dark streets bordering the Presidio.

Days later, the San Francisco Chronicle received a letter, postmarked October 13. It included a bloodstained piece of Paul Stine’s shirt. The writer mocked the police for failing to catch him and threatened to shoot schoolchildren. The case was now tied to a bold, urban murder — a departure from his pattern of attacking couples in secluded areas.

On November 8, 1969, the killer sent a card to the Chronicle containing a 340-character cipher. The code, known as the “340 cipher,” would remain unsolved for more than 50 years. The message, finally decrypted in 2020 by a team of code-breakers, revealed another taunt: the killer was “not afraid of the gas chamber” because it would “send me to paradise.” He said he had “enough slaves to work for me,” again referencing his afterlife fantasies.

In December 1969, a letter arrived linking the author to the unsolved 1966 murder of Cheri Jo Bates in Riverside, California. This murder — a young college woman found stabbed near her campus library — remains unconfirmed as part of the case. The letter’s author boasted, “I do have to give them credit for stumbling across my Riverside activity,” but no evidence tied the Zodiac directly to Bates’s death.

On March 22, 1970, Kathleen Johns was driving with her infant daughter outside Modesto, California. She reported being stopped by a man who offered to fix her car, then abducted her and her child. She managed to escape after several hours. The man’s appearance and behavior matched the composite sketches of the Zodiac. The crime was never confirmed as a Zodiac attack, but the killer himself mentioned Johns in a later letter.

On July 26, 1970, the Zodiac sent another letter to the Chronicle, this time including a map and a new 32-symbol cipher. He claimed it would reveal the location of a bomb set to go off in San Francisco, but no bomb was ever found. The map was marked with his cross-circle symbol, centered over Mount Diablo.

Paul Avery, a reporter for the Chronicle, received a Halloween card on October 27, 1970. The card contained a cryptic threat and the number “14,” implying the killer had claimed even more victims. Avery’s coverage had brought him into the heart of the case, and now he, too, was being taunted.

The Zodiac’s final confirmed letter was sent to the San Francisco Chronicle on January 29, 1974. The letter praised the film *The Exorcist* as “the best saterical comidy that I have ever seen.” The author signed off with another scorecard: “Me = 37, SFPD = 0,” claiming to have killed 37 people.

The investigation spanned multiple police departments, including the Vallejo Police Department, the San Francisco Police Department, and the Napa County Sheriff’s Office. Dozens of detectives, hundreds of officers, and countless amateur sleuths pored over the evidence. The police collected shell casings, tire tracks, fingerprints, and handwriting samples. They interviewed hundreds of suspects. The killer’s deliberate misspellings and grammatical errors in his letters complicated linguistic analysis. Some experts believed these quirks were meant to mislead investigators or mock them.

A crucial piece of evidence was the phone calls made to police after both the Blue Rock Springs and Lake Berryessa attacks. The calls were traced to payphones close to local police stations, indicating the killer’s boldness and his knowledge of police response times.

The ciphers sent to newspapers became central to the investigation. The 408-symbol cipher was cracked in just under a week by Donald and Bettye Harden. Their plaintext revealed the killer’s obsession with the afterlife and his desire for notoriety. The unsolved 340-character cipher, long a frustration for investigators, was only broken in 2020 by a team including David Oranchak, Sam Blake, and Jarl Van Eycke. They used computer algorithms to find possible encryption patterns, eventually discovering that the message contained no identity but more boasts and taunts.

Physical evidence linked the Lake Herman Road and Blue Rock Springs murders through ballistics: the same type of handgun, a .22-caliber semi-automatic, was used in both attacks. The Lake Berryessa attack was committed with a knife, further complicating the search for a pattern. At Presidio Heights, police recovered partial fingerprints from the taxi cab and witnesses provided a composite sketch. Still, no suspect could be positively matched.

Thousands of tips poured in after each letter was published. The public was terrified: parents kept children indoors, and taxi drivers in San Francisco refused to pick up fares alone at night. The killer’s letters made specific threats, including to “pick off the kiddies as they come bouncing out” of a school bus. Police began escorting buses and monitoring potential targets. The San Francisco Police Department assigned dozens of officers to the case at its peak, and the FBI maintained a file on the unidentified subject.

Over the years, investigators identified dozens of persons of interest. Handwriting experts compared the Zodiac’s distinctive block-lettered script to thousands of samples. Amateur code-breakers around the world tried to solve the remaining ciphers. Despite these efforts, no one was ever arrested or charged for the Zodiac murders.

The Zodiac’s reign of terror ended as abruptly as it began. After 1974, no more confirmed letters arrived. Some later communications were sent to newspapers and police, but their authenticity remains disputed. The official tally remains at five dead, two injured, and a nation left with unanswered questions.

The Zodiac Killer’s crimes exposed the vulnerability of both law enforcement and the public. The case revealed the limitations of forensic technology in the late 1960s and early 1970s: fingerprint analysis was still rudimentary, and DNA testing did not exist. The killer’s use of ciphers and public taunts demonstrated an unprecedented interplay between the media and a murderer. The Zodiac forced police and newspapers into a cat-and-mouse game played out on the front pages.

Former FBI profiler Gregg McCrary later noted that “the killer constantly changed his method of operating and openly admitted that murder was sport for him.” This unpredictability — shifting from shootings to stabbings, from couples in rural areas to a lone cab driver in the city — kept investigators guessing and heightened public fear.

The case highlighted how one individual, armed with cunning and a flair for theatrics, could dominate headlines and paralyze a region. The killer’s tendency to write letters filled with deliberate misspellings and inside jokes pointed to a desire not just for violence but for cultural immortality. Two of his ciphers remained unsolved for decades, the last broken more than half a century after it was mailed.

The Zodiac’s cross-circle symbol — hand-drawn on victims’ cars and letterheads — came to represent not just a killer but a mystery. The final confirmed letter, mailed in 1974, referenced a horror film and ended with a chilling score: 37 victims, zero arrests. Decades of investigation, thousands of suspects, dozens of lives lost or shattered — and the killer’s identity remains unknown.