A judge has ruled that Marin County will not pay for a legal adviser for a serial killing suspect who is representing himself in his murder trial.

Joseph Naso is charged in the killings of four Northern California prostitutes in the 1970s and 1990s. All of the victims had matching first and last initials.

Naso has pleaded not guilty.

According to investigative documents unsealed in the case, Naso kept a list in his Reno, Nev., home that described 10 women, including the four victims.

Naso initially chose to represent himself but later sought a legal adviser, saying his incarceration has limited his ability to conduct legal research. He also said he wasn't able to access funds to pay for a lawyer himself.

But Marin County Superior Court Judge Andrew Sweet ruled Friday that the 77-year-old Naso has enough money to pay for his own lawyer.

"You can employ an advisory counsel if you want, but you are not entitled to one at public expense," the judge told Naso. "You have the ability to access significant amounts of cash in a short amount of time."

Naso has almost $1 million in assets, including his home in Reno, according to prosecutors.

"I don't deny having assets in the bank, but I feel that something is going on behind my back," Naso told the judge. "I think maybe my ex-wife has been instructed to not get involved with giving me any money."

In issuing his ruling, the judge directed prosecutors to provide Naso with his Wells Fargo checkbook.