3. This Is the Zodiac Speaking
IMDb Rating: 7.2
If you watched the movie with Jake Gyllenhaal and Robert Downey Jr., you are probably familiar with this entry on our list of serial killer documentaries on YouTube. Zodiac is the serial killer whose identity remains unknown and who killed 5 persons and attempted 2 additional murders. The number of his victims is believed to be higher. The documentary explores the Zodiac killings, the investigation about the serial killer and features interviews with survivors and people who participated in the original investigation.
