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Joseph Naso, the "Alphabet Killer," may have been paying twisted homage to a death row inmate.

The assertion was made by retired FBI task force investigator Ken Mains, who is attempting to solve cold cases that may be linked to the 91-year-old. Naso’s crimes are explored in the new Oxygen true crime docuseries, "Death Row Confidential: Secrets of a Serial Killer."

Naso is a former photographer convicted in 2013 of killing four women.

SUSPECTED SERIAL KILLER ABDUCTED TEEN WHO CHEWED THROUGH BINDINGS TO ESCAPE

"… I was able to get into his brain [during my investigation] and understand that he had an idol, a role model, just like we all do," Mains told Fox News Digital. "His happened to be … Caryl Chessman. And Caryl Chessma

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