<ul><li>The Netflix docuseries 'This is the Zodiac Speaking' explores the hunt for a serial killer.</li><li>Arthur Leigh Allen was suspected to be the Zodiac Killer, but he was not convicted and maintained his innocence.</li><li>Police found hunting knives and dead animals in Allen's trailer, but DNA evidence didn't link him to the Zodiac Killer.</li><li>Arthur Leigh Allen died in 1992, still claiming innocence and stating that police had seized a document supporting his innocence.</li></ul>

Netflix's 'This is the Zodiac Speaking' tells the story of the hunt for a serial killer. Here's what happened to murder suspect Arthur Leigh Allen.

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