John Orellano, 34, of Cypress, is scheduled to be arraigned Friday in Norwalk. Orellano recently resigned from California High School.
The investigation into Orellano began a month ago after school officials notified authorities about illicit text messages from Orellano to the now 17-year-old female student. Further investigation revealed a sexual relationship between the two.
Investigators said the victim and the suspect maintained a friendly relationship for two years starting when the student was 15 years old. They said the relationship became sexual shortly after Orellano began sending her illicit text messages in January.
He was arrested Wednesday for unlawful sexual intercourse with a minor and is being held on $240,000 bail.