Police arrested 18-year-old Cooper Potter on Wednesday and booked him into county jail for continuous sexual assault of a minor.
Investigators say the victim is a girl who had been at Potters Day Care and was molested over the course of a year.
Officials are not sure if this is an isolated incident. If you have any information about the case, you're urged to contact the Ventura Police Department at (805) 339-4416.
Potter is being held on $500,000 bail.