The Zodiac Killer terrorized the world after murdering several people in Northern California in the '60s and '70s, even sending cryptic messages to the police as a way to taunt them. They're one of the most famous serial killers in the world, and also probably the scariest to think about, since we still don't know who actually committed the crimes. This chilling page does a deep dive into the entire investigation, including details about each specific attack, the two survivors, and all of the current suspects.