Ep 4. The Secret FBI Files

In The Hunt for the Zodiac Killer season 1 episode 4, titled "The Secret FBI Files," investigators delve into previously unreleased documents from the FBI's investigation into the infamous Zodiac Killer case. The episode includes interviews with experts in the case who explain the significance of these newly discovered files.

Viewers are taken on a journey through the decades-long investigation, including the FBI's attempts to track down the killer through his letters and ciphers. The episode also explores the larger cultural impact of the case, including the Zodiac Killer's influence on pop culture and true crime enthusiasts alike.

Through the use of archival footage and expert analysis, the episode uncovers details about the FBI's investigation that have never been released to the public. This includes insights into the agency's attempts to crack the killer's codes, as well as its attempts to track him down based on his psychological profile.

In addition, the episode features interviews with family members of the Zodiac Killer's victims, who offer their own insights into the case and the impact it has had on their lives. They discuss the emotional toll of losing a loved one to such a brutal crime and the ongoing search for answers.

Overall, "The Secret FBI Files" offers viewers a rare glimpse into one of the most infamous unsolved cases in American history. The episode sheds new light on the investigation and its impact on the larger culture, while offering hope that one day the killer might finally be caught.