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This week on “Zone 7,” Sheryl McCollum sits down with Casey Sherman, a renowned author and investigative journalist, to delve into the chilling murder of his aunt, Mary Sullivan. Sullivan is widely believed to be the last victim of the infamous Boston Strangler, and her tragic death has left a lasting mark on Sherman’s family.
During their discussion, Casey Sherman sheds light on why his family has long harbored doubts about the official narrative surrounding the case. He highlights evidence that, in his opinion, challenges the conventional understanding of the events.
The conversation explores key aspects such as DNA analysis, the mysterious disappearance of confession tapes, and potential alternative suspects. These elements, according to Sherman, cast significant doubt on Albert DeSalvo’s alleged involvement in the string of murders.
About the Guest
Casey Sherman is a bestselling author recognized by The New York Times and a seasoned investigative reporter. He is known for his in-depth reexaminations of major criminal cases and historical incidents.
He is the author of “A Rose for Mary,” which examines the murder of his aunt, Mary Sullivan, and the lingering questions surrounding the Boston Strangler case.
About the Host
Sheryl “Mac” McCollum is an active crime scene investigator for a Metro Atlanta Police Department and the director of the Cold Case Investigative Research Institute, which partners with colleges and universities nationwide. With more than 4 decades of experience, she has worked on thousands of cold cases using her investigative system, The Last 24/361, which integrates evidence, media, and advanced forensic testing.
Her work on high-profile case include, in part, The Boston Strangler, Natalie Holloway, and Tupac Shakur. McCollum’s work on the Moore’s Ford Bridge lynching led to her Emmy Award for “CSI: Atlanta” and induction into the National Law Enforcement Hall of Fame in 2023.
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Email: coldcase2004@gmail.com
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Facebook: @sheryl.mccollum
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Preorder Sheryl’s upcoming book, “Swans Don’t Swim in a Sewer: Lessons in Life, Justice, and Joy from a Forensic Scientist,” releasing May 2026 from Simon and Schuster.
[Feature Photo: Detectives inspect cell from which Albert DeSalvo, 35, self-styled Boston Strangler escaped early today, Feb. 24, 1967 at Bridgewater, Mass. State Hospital. (AP Photo)]