Updated

Prosecutors say a man charged with killing four Northern California women kept a safety deposit box to store items related to the victims separate from one he used for money.

Marin County prosecutor Rosemary Slote said during a pretrial hearing Tuesday the contents of that box are significant evidence in the case against Joseph Naso. Slote was seeking to subpoena bank records to confirm the box belonged solely to Naso.

The 77-year-old Naso is charged with the murders in the 1970s and 1990s of four prostitutes with matching initials: Roxene Roggasch, Carmen Colon, Pamela Parsons and Tracy Tafoya.

Prosecutors say Naso also kept a list in his Reno, Nev., home that described 10 women, including the four victims. Authorities have not said if the remaining six have been located.