Both had been shot once in the side of their heads and once in the back of their necks. Siegrist had also been sexually assaulted.
Earlier this year, Riverside County's cold case unit submitted evidence from the crime scene to a private laboratory. On Oct. 4, the lab linked the DNA to Prieto. The department said it delayed notifying the public to ensure Virginia jurists were not influenced during the penalty phase of Prieto's trial there.
Prieto has been linked to nine murders and four sexual assaults, including the 1992 murder and rape of 15-year-old Yvette Woodruff of Ontario, the crimes for which he was sentenced to death. He is appealing his California death sentence.
In 2005, preliminary DNA tests implicated him in three 1988 Virginia slayings. Prosecutors from Fairfax County, Va., extradited Prieto from California to face trial for two of those murders.
Prieto has operated with three other accomplices in the past, and authorities believe the Rubidoux murders involved one or two additional suspects.
Riverside County sheriff's homicide investigators are asking anyone with information about the case to call (951) 955-2777.
| 
