The Zodiac Killer: California's Unsolved · 28 Aug 2026 · 14 min

Northern California's First Victims: How the Zodiac Killings Began

In December 1968, two teenagers were murdered on Lake Herman Road — and a carefully constructed reign of terror began. This is the chapter that started everything: the first victims, the coded letters, and the killer who wanted an audience.

The Zodiac Killer: California's Unsolved
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Northern California's First Victims: How the Zodiac Killings Began

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What's covered

The Night It Started

On December twentieth, nineteen sixty-eight, two teenagers drove out to a quiet stretch of road near Benicia, California, and never came back. What followed wasn't just a murder investigation.

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Building the Pattern

Solano County investigators worked the Lake Herman Road case through the winter and into spring with little progress. Then, on July fourth, nineteen sixty-nine, the pattern repeated.

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The First Cipher Breaks

The cipher attached to those letters, known as the four-oh-eight for its total number of characters, was not cracked by the FBI. It wasn't cracked by law enforcement at all.

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The Killing Continues

Through the summer of nineteen sixty-nine, investigators in multiple counties were trying to coordinate across jurisdictional lines. The murders had occurred in Solano County.

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The Letters to the Chronicle

After the Stine murder, the Zodiac sent another letter to the Chronicle. This one included a swatch of Paul Stine's bloodstained shirt.

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Suspects and Dead Ends

The name that would eventually dominate the investigation was Arthur Leigh Allen. A convicted child molester with a Navy background, Allen was first seriously considered as a suspect in the early nineteen seventies.

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The 340 Cipher

Fifty-one years passed before the second major cipher broke. The three-forty, named for its character count, had been sent by the Zodiac to the Chronicle in November nineteen sixty-nine.

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What the Case Has Always Been

There's a version of this story that reads as a failure. Five confirmed victims.

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Chapter summary auto-generated from the verified script. Listen to the full episode for the complete content.