In the late 1960s, a serial murderer who called himself the Zodiac Killer terrorized Northern California. In under a year, from December 1968 to October 1969, he killed at least five people. He then sent cryptic letters to local newspapers, some of which included ciphers. But who was the Zodiac Killer and why hasnt a suspect ever been charged in this case?To date, no one has ever definitively confirmed the Zodiac Killers identity. But a number of suspects have been floated in the years since the infamous criminal sent his last batch of letters in the 1970s. Sons have accused their fathers, amateur investigators have suggested new people of interest, and the police have continued to investigate the horrific crimes.Below, discover the stories of nine compelling Zodiac Killer suspects.Gary Francis Poste: The Scarred VeteranThe Case BreakersSome who knew Gary Francis Poste suspect that he might have been the murderer.In 2021, an investigative team called the Case Breakers said they solved the mystery of the Zodiac Killers identity. They pointed the finger at Gary Francis Poste, a California-based house painter, who died in 2018.According to the investigators a team made up of former cops, military intelligence officers, and journalists several things about Poste made him a likely Zodiac Killer suspect. For starters, he had distinctive scars on his forehead, which the investigators claim that the murderer shared. [There is] photographic proof, as a former FBI agent put it, of irrefutable scars on our Zodiacs forehead spotted by 3 witnesses and an observing cop, then later passed on to the 1969 SFPD sketch artist, the Case Breakers explained in a press release. Seeing Postes photo next to one of the police sketches of the Zodiac Killer helps put things in perspective.The Case BreakersThe Case Breakers believe that Gary Francis Postes distinctive scars make him a compelling suspect.The investigative team also believes that removing Postes name from one of the Zodiac Killers infamous ciphers reveals a new message. And they point to a paint-splattered military wristwatch found near possible Zodiac victim Cheri Jo Bates in Riverside, California in 1966. They believe the watch could have belonged to Poste, who had once served in the U.S. Air Force. Whats more, many who knew Poste acknowledged that he could be a killer. While living in Groveland, California, Poste reportedly recruited young men in town into a criminal posse. Poste even allegedly confessed to being the elusive serial killer to one of his recruits.But not everyone buys Gary Francis Poste as a Zodiac Killer suspect. One expert on the case, Tom Voigt, told Rolling Stone that the Case Breakers claims about Poste were completely bogus and hot garbage. Voigt says that the police sketch of the Zodiac Killer didnt really show scars on his forehead and that it was just shading to fill in the picture. He also adds that there are other, much more compelling Zodiac Killer suspects out there. Who Was The Zodiac Killer? The Compelling Case For Arthur Leigh AllenYouTubeJohn Carroll Lynch as Arthur Leigh Allen in the 2007 film Zodiac.A 2007 film about the Zodiac Killer, Zodiac, portrays a man named Arthur Leigh Allen as a likely Zodiac Killer suspect. But though the movie was a work of fiction, Allens connections to the case are very real. As SF Weekly points out, investigators have been able to tie Allen to a number of the Zodiac Killers crime scenes. He lived near Zodiac victim Darlene Ferrins workplace and may have stalked her, frequently visited Lake Berryessa, where the Zodiac Killer attacked Cecelia Shepard and Bryan Hartnell, and was possibly in Riverside when Cheri Jo Bates was murdered. Whats more, Allen owned a distinctive watch that featured the same crosshair symbol that the Zodiac Killer signed his ciphers with and wore on his chest during the Lake Berryessa attacks. Tom Voigt additionally reports on his Zodiac Killer website that Allen told a friend he was writing a novel about a murderer called Zodiac who would kill couples at random.Zodiac Killer FactsArthur Leigh Allen strikes many as a convincing Zodiac Killer suspect.The reality is that Allen is the suspect you just cant quit, Voigt explained to Rolling Stone. I just cant quit that Big Al If he wasnt the Zodiac, he might be responsible for some other murders.But though some experts see Allen as a strong suspect, others arent so sure. Physical evidence like DNA, fingerprints, and handwriting samples failed to definitively tie Allen to the notorious murder spree. If not Allen who died in 1992 then who was the Zodiac Killer?The post Nine Of The Most Likely Zodiac Killer Suspects And The Disturbing Stories Behind Them appeared first on All That's Interesting.