Serial Killer Claims He Murdered 26 Women in Shocking New Documentary

One of California’s most infamous killers is back in the spotlight — and this time, the story is even darker.

Joseph Naso, the 90-year-old former photographer sentenced to death in 2013 for murdering four women, is now accused of killing far more than anyone realized. In a shocking new Oxygen documentary, Death Row Confidential: Secrets of a Serial Killer, premiering September 13, a fellow San Quentin death row inmate claims Naso confessed to murdering 26 women.

“He’s guilty of more than anyone knows,” inmate William Noguera says in the series. “He told me everything, and I wrote all of it down.”

Naso’s chilling double life stunned the country when he was first convicted. By day, he was a father of two, Little League coach, and school photographer. By night, investigators say, he was a sadistic killer. Among his belongings, police discovered disturbing photographs of dead women and a handwritten “hit list” containing cryptic descriptions of ten victims.

For years, Naso denied being a serial killer. But according to Noguera, who spent over a decade building trust with him inside San Quentin, the killer eventually opened up.

“When I told him, ‘Well, they got you because of a list of 10,’ he started laughing,” Noguera recalled. “He said, ‘They got it all wrong. Yeah, I killed those women, yes. But those aren’t my list of 10. Those are my top 10.’”

The documentary also reveals haunting clues investigators discovered in Naso’s home, including a collection of 26 gold coin heads — which Noguera says Naso called his “trophies,” each representing a woman he murdered.

Determined to get answers, Noguera compiled a 300-page dossier of locations, cryptic notes, and partial confessions, passing it to retired FBI task force investigator Ken Mains. Together, they began connecting Naso to several cold cases, including the disappearance of Berkeley woman Lynn Ruth Connes in the 1970s.

According to the files, Naso described luring a woman through a modeling ad, killing her, and dumping her body under the Richmond-San Rafael Bridge — the same area where Connes’ bike was later found chained.

Convicted of murdering four women with matching first and last initials — earning him the nickname “Alphabet Killer” — Naso’s new alleged victim count has reignited investigations into unsolved murders across California.

Authorities also previously uncovered a diary describing over 100 sexual assaults dating back to the 1950s, many involving underage girls. Now, the FBI and multiple law enforcement agencies are re-examining decades-old cold cases.

As Detective Mains puts it, “Our two minds, cop and convict, working together… I know we can solve unsolved murders. Let’s get them.”