Investigators have since drawn connections between Allen's classroom activities and the Zodiac's infamous communications. One of the Zodiac's letters specifically quoted lyrics from "I've Got a Little List," and the serial killer was known for purposely misspelling common words.

People who knew Arthur Leigh Allen as children say he confessed, drugged them, and brought them to the sites of Zodiac killer murders

Netflix documentary This is The Zodiac Speaking takes another look at the horrific murders of The Zodiac Killer. We look at the prime suspect in the case, Arthur Leigh Allen, and what happened to him in the aftermath of the killings.

Netflix's Zodiac Killer docuseries contains first hand accounts that support the claims from David Fincher's classic true crime film.

Netflix’s This is the Zodiac Speaking focuses on Arthur Leigh Allen, but eight other men have been accused of being the killer.

Arthur Leigh Allen has been the only publicly identified suspect by the police, however there was never enough evidence to charge him. Therefore, it cannot be confirmed whether or not Arthur Leigh Allen was the Zodiac Killer. In the documentary, the Seawater siblings claimed that Allen confessed to being the Zodiac killer.

Netflix has released a new true crime documentary series called This is the Zodiac Speaking, and it's got people talking about the legendary case all over again

The key to the three-part docuseries is interviews with the Seawater siblings, who knew Allen years before the Zodiac's murders in Northern California.

The Zodiac Killer’s enigmatic message was finally decoded nearly 50 years after the murder spree that shocked California, USA.