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Joseph Naso, the “Alphabet Killer,” may have been paying twisted homage to a death row inmate.
Retired FBI task force investigator Ken Mains has expressed the belief that cold cases potentially connected to 91-year-old Joseph Naso can still be resolved. Naso’s notorious activities are the focus of the new Oxygen true crime series, “Death Row Confidential: Secrets of a Serial Killer.”
Naso is a former photographer convicted in 2013 of killing four women.
The photo depicts Medgar Avenue in Black Springs, Nevada, where Joseph Naso once lived, with his former home being the first on the left. Currently, Naso is on death row in California. (Karl Mondon/Media News Group/East Bay Times via Getty Images)
Mains emphasizes the urgency of solving these cases before Naso takes any undisclosed information to his grave. In the series, Mains is featured talking to families who have been searching for answers regarding their loved ones for many years.
“It was emotionally taxing,” Mains revealed. “You face the families’ emotions, be it anger, love, or hate. However, challenging situations shouldn’t be avoided. I was willing to sit with them and share what transpired.”
Mains hopes the documentary raises awareness about the cold cases and his quest to solve them.

Joseph Naso has since been moved from San Quentin State Prison in Marin County, Calif. (Smith Collection/Gado/Getty Images)
“Solving these cases isn’t about me,” Mains remarked. “It’s my profession, what I’ve done for decades. But the broader story revolves around Bill Noguera—someone punished for a crime he committed at 18, and now, well into his 60s, he’s seeking to contribute positively. He’s done so and continues his efforts.”
Mains reflected, “The overarching message is about life’s potential. Redemption is achievable. The families can take some solace in knowing their loved ones are not forgotten.”