Arthur Leigh Allen has been a leading suspect in the Zodiac case for decades. Here's why the Seawater family believes he's the infamous killer.

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.

The Zodiac Killer was connected to several murders in Northern California during the 1960s, earning his cryptic name by sending taunting letters to local newspapers that threatened killing sprees if they weren't published.

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.

As a documentary series revisiting the infamous tale of the Zodiac Killer, with a special focus on its prime suspect, Arthur Leigh Allen, Netflix’s ‘This is the Zodiac Speaking’ is truly gripping. That’s because it incorporates not just archival footage but also exclusive interviews to shine a clear light upon why many consider him to

Arthur Leigh Allen is the prime suspect in the unsolved Zodiac Killer crimes, though his fate may prevent justice from ever being served.

This Is the Zodiac Speaking is a new documentary on the infamous Zodiac Killer. In the documentary, David and Connie Seawater, who knew the main suspect for the crimes, Arthur Leigh Allen, are shedding new light on whether the man police always suspected was truly the serial killer who sent taunting ciphers to reporters for years and threatened to kill more people if the messages weren’t published in the front page of San Francisco newspapers.