(CNN) A well-known surgeon from Newport Beach and his girlfriend are accused of drugging and sexually assaulting two women, and Southern California authorities said they believe there could be many more victims.

Grant William Robicheaux, 38, and Cerissa Laura Riley, 31, are charged with rape by use of drugs, oral copulation by anesthesia or controlled substance, assault with intent to commit sexual offense, and possession of a controlled substance for sale. Robicheaux is also accused of firearms violations.

Grant Robicheaux and Cerissa Riley

On Robicheaux's phone, investigators found hundreds of clips of women in various states of consciousness, Orange County District Attorney Tony Rackauckas told reporters Tuesday. He said that many of the women in the videos appeared unable to consent to sexual contact. Many of the videos also included Riley, he said.

"Based on this evidence we believe that there might be many unidentified victims out there," he said.

Rackauckas estimated there were more than 1,000 videos. He did not say whether the same women were seen in multiple clips.

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