"Based on the really brazen nature of this crime, we're concerned that there could be other victims. And we would encourage them to come forward to law enforcement," said Farrah Imami, a spokeswoman for the Orange County District Attorney's Office.
The victim, a 45-year-old woman, had called for a cab after having drinks in Sunset Beach on July 6, 2010. While driving the woman to her mother's Seal Beach home, Bosley allegedly punched the victim in the face, dragged her inside the home and raped her.
Police say the victim went in and out of consciousness during the assault.
Bosley was released from custody after posting $100,000 bail, and he is still driving a cab.
Bosley is due back in court on Jan. 18. If convicted, he faces eight years in state prison.
Police are concerned it may have happened before. Anyone with information related to the incident was urged to call the Orange County District Attorney's Office at (714) 347-8794.