Investigators now say they're examining several open homicides to determine if 78-year old Joseph Naso is responsible.
Just yesterday, Naso was ordered to stand trial for the murders of two Bay Area women in the 1970's and two Yuba County women in the 1990's.
The new investigation started after prosecutors revealed a cryptic list kept by Naso that made reference to 10 women. The list included a reference to an apartment building in the city's Tenderloin neighborhood.
