Nine Zodiac Killer Suspects And The Disturbing Stories Behind Them

Published December 13, 2022
Updated October 23, 2024

Who Was The Zodiac Killer? Why Some Think Richard Marshall Was The Infamous Murderer

Was Richard Marshall The Zodiac Killer

YouTubeRichard Marshall appeared to have multiple things in common with the Zodiac Killer.

Between 1969 and 1974, the Zodiac Killer sent over 20 letters, usually to local newspapers in Northern California. And certain details that he mentioned in the notes have led some to believe that the Zodiac Killer was movie projectionist and ham radio operator Richard Marshall.

According to History, the Zodiac Killer often dropped hints about his life and interests in his letters, and many of them aligned perfectly with Marshall’s. Both liked the film The Red Phantom, both apparently lived in basement apartments, and both liked felt-tip pens and unusually-sized paper.

“I must have a double floating around,” Marshall said during a 1989 TV interview, in which he also professed his innocence. “The characteristics you just mentioned fit me almost to a T.”

Richard Marshall In 1989

YouTubeRichard Marshall admitted that he shared interests with the Zodiac but denied being the killer.

As Voigt explains on his Zodiac Killer website, Marshall first emerged as a Zodiac Killer suspect in 1976 after he made “suspicious” comments over his ham radio. But some investigators don’t think he’s a strong suspect.

“Marshall makes good reading but not a very good suspect in my estimation,” said Napa County sheriff’s detective Ken Narlow.

Voigt also acknowledges that detectives visited Marshall at a care facility shortly before his death in 2008, and they somehow determined that he was not the murderer. But they didn’t — to the best of Voigt’s knowledge — test Marshall’s DNA. “Therefore, in my opinion,” Voigt wrote on his site, “Marshall remains a viable Zodiac suspect.”

author
Kaleena Fraga
author
A senior staff writer for All That's Interesting since 2021 and co-host of the History Uncovered Podcast, Kaleena Fraga graduated with a dual degree in American History and French Language and Literature from Oberlin College. She previously ran the presidential history blog History First, and has had work published in The Washington Post, Gastro Obscura, and elsewhere. She has published more than 1,200 pieces on topics including history and archaeology. She is based in Brooklyn, New York.
editor
Jaclyn Anglis
editor
Based in Brooklyn, New York, Jaclyn Anglis is the senior managing editor at All That's Interesting, where she has worked since 2019. She holds a Master's degree in journalism from the City University of New York and a dual Bachelor's degree in English writing and history from DePauw University. In a career that spans 11 years, she has also worked with the New York Daily News, Bustle, and Bauer Xcel Media. Her interests include American history, true crime, modern history, and science.
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Fraga, Kaleena. "Nine Zodiac Killer Suspects And The Disturbing Stories Behind Them." AllThatsInteresting.com, December 13, 2022, https://allthatsinteresting.com/who-was-the-zodiac-killer. Accessed August 2, 2025.