A former high school teacher from Ottawa was arrested Thursday on suspicion of unlawful sexual relations with a student, the Franklin County sheriff said Friday.

The arrest was the result of an investigation of sexual conduct between the 27-year-old man and a 17-year-old student at Central Heights High School in Richmond, where the suspect was a teacher, Sheriff Craig Davis said.

The suspect is being held at Franklin County Jail pending charges by the Franklin County attorney’s office, the sheriff said in a news release.