The Zodiac Killer: The Unsolved Case That Terrorized California

In the late 1960s, a killer began attacking people across Northern California. Then the letters started. Someone calling himself “Zodiac” sent messages to newspapers, claimed responsibility for attacks, taunted investigators and included mysterious coded ciphers that he challenged the public to solve. Some of those codes were cracked. Others remained unexplained for decades. Despite witness descriptions, fingerprints, handwriting comparisons, countless suspects and one of the most famous investigations in American criminal history, the Zodiac Killer was never conclusively identified. In this episode of Crime Unknown, we break down the confirmed attacks, the letters and ciphers, the evidence investigators followed, the major suspects, and why the case remains unsolved more than half a century later. Inside the cases you thought you knew. Chapters 00:00 The Zodiac Killer 00:30 The Letters Begin 01:00 The First Attacks 01:30 Lake Herman Road 02:00 Blue Rock Springs 02:30 The Killer Contacts Police 03:00 Lake Berryessa 03:45 The Message Left Behind 04:15 The Paul Stine Murder 04:45 The Witness Description 05:15 The Zodiac’s Letters 05:45 The Ciphers Begin 06:15 How the Zodiac Codes Worked 06:45 The First Major Cipher 07:30 The 340 Cipher 08:15 The Codes That Remain 08:45 Following the Evidence 09:15 Arthur Leigh Allen 10:00 Why the Evidence Didn’t Fit 10:30 Other Suspects and New Leads 11:15 DNA and Modern Investigation 11:45 Why the Case Is Still Unsolved 12:15 Who Was the Zodiac Killer? #ZodiacKiller #TrueCrime #CrimeUnknown #UnsolvedMystery #ColdCase #CrimeDocumentary