Christopher James Ray Sr., a resident of Riverside's Casa Blanca neighborhood, was arrested in February in connection with allegations that he abused a victim years ago, according to police.
Since his arrest, four additional victims have been identified, investigators said.
Detectives believe there may be more victims and are asking anyone with information to come forward.
If you'd like to remain anonymous, you can submit tips through the Riverside Police Department's Atlas 1 mobile app using the secure "Send a Message" feature. The app is available for download on both Apple and Android devices.