SACRAMENTO (CBS13) — The man suspected of being the NorCal Rapist is facing even more charges. Sacramento County prosecutors filed four new charges against 49-year-old Roy Charles Waller, linking him to the rapes of two women from Davis.

Waller was arrested last year after the Sacramento District Attorney’s office used DNA evidence and a genealogy database to track him down. He had been working as a safety specialist at UC Berkeley.

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Waller is now facing 45 counts tied to nine victims across six Northern California counties from the Bay Area to Sacramento.

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The string of attacks started in 1991. His last known victims were two women in Natomas back in October 2006.