A Spring Westfield High School teacher is accused of having sex with a student. Investigators said the woman was caught inside a classroom performing oral sex on a teenager.

The teacher is 42-year-old Shannon Kay Hrozek. She is a 10th grade English teacher at Westfield.

According to court documents, she was caught by the school's assistant principal performing oral sex on a 16-year-old male student inside Classroom 143 at the high school.

A school principal used a master key to get into the classroom after a janitor had informed him that the teacher and a student were in the room alone with the lights off.

The Harris County District Attorney’s Office accepted sexual assault of a child charges Monday morning. Hrozek was being held in the Harris County Jail, but posted a $50,000 bond Monday night.

She is the third Spring ISD teacher in the last four months that has been charged with having sex with a student.

Last month Carlos Valencia, another Westfield teacher, was charged with having sex with a FFA student.

In October, teacher Alison Moesbeck from Duett Middle School was charged with sexual assault of a child.