Notorious “Alphabet’’ serial killer Joseph Naso has reportedly claimed that he’s responsible for the deaths of 22 additional women.

According to ABC 7, the 91-year-old murderer, currently in California’s San Quentin prison after being sentenced to death, was convicted of killing four women who had the same letters in their first and last names.

Now, according to a former inmate, Naso has claimed that he’s responsible for a total of 26 deaths. Naso also reportedly stated that the murder of Pamela Lambson, 19, said to be committed by “The Dating Game Killer” Rodney Alcala in 1977, was actually someone he murdered.

“It was a running joke for him, because another serial killer had been accused,” former inmate Bill Noguera, who became close to Naso at one point, told the outlet.

Noguera, who said Naso sought his protection in prison, stated that the elderly serial killer provided additional details, such as where he met Lambson, how he posed as a professional photographer, and how he later posed her body against a tree.

“He gave me a lot of little details that matched,” Noguera said. “One of them was that he met her at an A’s game.”

He added that Naso kept a greatest hits list of the women he had killed, which according to what Noguera told Vanity Fair, were his favorites.

“She just drove me crazy about being an entertainer, and these photographs were because she was going to be a star, and she was dating one of the players from the A’s,” Noguera said, quoting Naso. “So I posed her, now she’s getting all the entertainment and all the exposure she needs.”

Naso was angry that Alcala had been pinned for the murder and how media reports listed Alcala as a professional photographer.

“That really bothered him. So he often talked about how ‘they got him for one of mine,’” Noguera told Vanity Fair.

Noguera said he contacted cold case detective Ken Mains, who then helped piece an additional murder together: the killing of Lynn Ruth Connes, 20.

Naso said he didn’t know her name at the time, but called her the “Girl from Berkeley,” and provided enough information for the detective to make the connection.

“Death Row Confidential: Secrets of a Serial Killer,” premiering on Oxygen on September 13, will showcase interviews with Naso.

[Feature Photo via Marin Superior Court]