Naso, 79, was convicted last month with the murders of Roxene Roggasch, 18, who was dumped west of Fairfax in 1977; Carmen Colon, 22, who was found near Port Costa in 1978; Pamela Parsons, 38, who was found in Yuba County in 1993; and Tracy Tafoya, 31, who was found in Yuba County in 1994.