Zodiac Killer: Why Hasn’t He Been Identified? The Evidence Explained

The Zodiac Killer left behind witnesses, letters, ciphers, possible fingerprints, physical evidence—and even a partial DNA profile. So why, more than half a century later, do we still not know who he was? In this episode of UNKNOWN CASES, we follow the evidence behind one of America’s most infamous unsolved mysteries. From the surviving witnesses and the famous police composite sketch to the Zodiac letters, the 408 cipher, the 340 cipher, the mysterious Z13, possible fingerprints, DNA evidence, and the case against Arthur Leigh Allen, we examine why so many promising clues failed to reveal the killer’s identity. We investigate: • The surviving witnesses who saw the attacker • The Zodiac Killer’s letters and handwriting • The 408 cipher and what it actually revealed • The 340 cipher that remained unsolved for 51 years • The still-unsolved Z13 “My name is” cipher • The Paul Stine murder and the famous composite sketch • Possible fingerprints recovered from Stine’s taxi • The bloodstained piece of Paul Stine’s shirt mailed to a newspaper • The DNA problem investigators still face • Why Arthur Leigh Allen became the most famous Zodiac suspect • Why decades of evidence still haven’t produced a confirmed identity The strange thing about the Zodiac case isn’t that the killer left no evidence. It’s that he left so much of it. Witnesses. Handwriting. Letters. Ciphers. Possible fingerprints. Physical evidence. Again and again, investigators appeared to be getting closer to a name. Again and again, the trail stopped. Was the Zodiac Killer extraordinarily careful? Did investigators miss the one clue that could have identified him? Or is the final answer still sitting somewhere inside an old envelope, an evidence archive, an unsolved cipher—or a forgotten file? The evidence ends here. The mystery doesn’t. If you want to open another unknown case with me, subscribe to UNKNOWN CASES and turn on notifications. Because some mysteries don’t disappear with time. They wait. #ZodiacKiller #TrueCrime #UnsolvedMysteries #Zodiac #ColdCase #UnknownCases #UNKCases