The Son of Sam was a renowned serial killer who preyed on New York City in the summer of 1976. After a formal confession, he has officially been identified as David Berkowitz. But in the years since his confession, Berkowitz has amended his story. “The Sons of Sam: A Descendant into Darkness” aims to uncover the truth.

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After Berkowitz was convicted, “Ultimate Evil” author Maury Terry became convinced the terror wasn’t over. Terry was convinced he didn’t work alone and that the Sons of Sam continued on after Berkowitz. The documentary uses archival news footage, conversations with the people involved with the investigation, and Terry’s own words and case files to investigate if Berkowitz really had accomplices.

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The Netflix docuseries was directed by Joshua Zeman (“Murder Mountain“). Sara Enright acted as showrunner and was among “The Sons of Sam: A Descendant into Darkness’s” executive producers. Here’s the official summary for “The Sons of Sam: A Descendant into Darkness:”

The hunt for the “Son of Sam” captivated the world in the late 1970s, but the story behind one of America’s most notorious serial murderers is all but forgotten — until now. While the arrest and conviction of David Berkowitz brought the nightmare to an end for many New Yorkers, for journalist and Ultimate Evil author Maury Terry, the real mystery was just beginning. Terry, convinced Berkowitz had not acted alone, would go on to spend decades attempting to prove that the web of darkness behind the murders went deeper than anyone imagined – and his pursuit of that elusive truth would eventually cost him everything.

“The Sons of Sam: A Descendant into Darkness” drops globally on Netflix on May 5. Take a look at the new trailer below.