TODAY'S UPDATE: 11:20 a.m. The headmaster of Warner Christian Academy said today that Cynthia Horvath came to his school with excellent recommendations and this is the first time a teacher has been accused of having a sexual relationship with a student at the South Daytona school.

Mark Tress, the school's headmaster, also said he is confident that the alleged activity is limited to one student, an unidentified 17-year-old.

Faced with termination, Horvath, an English teacher and cheer coach, resigned from Warner Christian Academy on Oct. 12, Tress said.

The next day he contacted South Daytona Police, who referred the investigation to police departments in Port Orange and Daytona Beach after determining the sexual activities between the teacher and student took place in those cities.

Police in Port Orange and Daytona Beach both charged Horvath on Wednesday with illegal sexual activity with a minor.

Tress said Horvath passed a background check before she was hired. "Her recommendations were stellar," he said. "She had an excellent rapport with all the students."

Although the teenager involved with the teacher still attends the school, the school has not yet decided if he will be allowed to remain at the school, Tress said. "That has not been resolved," he said. "We want to do what's best for the student and what's best for the school."

The school, in its 38th year, has about 650 students in nursery through 12th grade. "This is the first time we have ever experienced anything like this," Tress said.

Tress said he is not sure there are any steps that could have been taken to prevent the incident since the school conducts thorough background investigations.

But he has met with the school's faculty since the incident came to light.

"I've asked the teachers to immediately report anything that doesn't look right," he said. "We want to make sure we're not missing any signs that indicate there is a problem."