A Choctaw High School teacher is accused of having a sexual relationship with a student and exchanging inappropriate text messages, the Oklahoma County sheriff’s office reported Thursday.

Kristen Betz, 43, was arrested Wednesday and booked into the Oklahoma County jail on a complaint of second-degree rape. She was released after posting $10,000 bail, according to the sheriff’s office.

Choctaw police initially investigated the case after being notified by school administrators about alleged inappropriate acts between Betz and a 17-year-old student, according to the sheriff’s office.

The student told police he and Betz had been having sex for about a month in different locations. He estimated they had sex 11 times during that period, according to the probable cause affidavit.