Arthur Leigh Allen: The Zodiac Killer’s Prime Suspect? | Episode 9

Was Arthur Leigh Allen the Zodiac Killer? In Episode 9 of our Zodiac Killer series, we investigate the man who became the most infamous suspect in one of America’s most haunting unsolved murder cases. Arthur Leigh Allen was the only suspect ever publicly named by police, and for decades detectives believed the evidence pointed straight at him. This episode examines the full case against Allen: Donald Cheney’s account that Allen described the Zodiac’s name, symbol, and methods before they were public His connection to Vallejo and multiple crime locations The Zodiac Sea Wolf watch The Lake Berryessa alibi and the bloody knives story Michael Mageau’s later photo identification The searches of Allen’s home The pipe bombs and typewriter found in his possession The alleged admissions described by the Seawater siblings in Netflix’s 2024 documentary This Is the Zodiac Speaking We also examine the evidence that points away from Allen: Fingerprint exclusions Handwriting comparisons that failed to match Partial DNA that did not identify him Witness problems and the limits of memory decades later Arthur Leigh Allen may be the strongest Zodiac suspect ever put forward — but the forensic record never proved he was the killer. This is the complete breakdown of the case for and against the Zodiac Killer’s prime suspect. Subscribe to Crime Time Inc for more deep-dive true crime investigations. 00:00 Prime Suspect Setup 01:43 Allen Early Life 04:24 Grievances And Red Flags 05:54 Cheney Bombshell Tip 07:00 Lovers Lane Details 11:54 Credibility And DNA Wrinkle 15:10 First Police Interview 16:26 Watch Alibi And Knives 19:33 Handwriting Excludes Allen 20:43 Search Warrant And Arrest 22:51 Spinelli Names Allen 25:27 1991 Search And Bombs 27:48 Blue Rock Springs Revisited 28:58 Mageau Photo Lineup 30:55 Voice Witness Limits 32:28 Allen Dies and Search 33:14 DNA and Handwriting Tests 35:52 Forensic Caveats Explained 37:01 Netflix Seawater Claims 40:49 Beach and Riverside Trips 44:35 Confession Accounts Weighed 46:19 Case For and Against 53:20 Why Allen Endures 56:53 Final Question and Next Next episode: if Arthur Leigh Allen was not the Zodiac, who else could it be? #ZodiacKiller #ArthurLeighAllen #TrueCrime #UnsolvedMystery #SerialKillers #CrimeTimeInc