The teacher was placed on administrative leave and received psychiatric treatment at Vanderbilt University Medical Center.
The Metro Nashville school board earlier this spring decided to take steps to dismiss the teacher.
Teacher Punches Student
A cell phone video taken last May shows a female Florida art teacher warned an unruly male student to "step back" before punching him in the face.
Witnesses said they saw the student touched the teacher first and law enforcement authorities decided not to charge the woman with any crime, saying the video didn't prove that the teacher wasn't acting in self-defense, The Tampa Bay Times reported.
"You couldn't put a piece of paper between them," Brian Trehy, of Florida State's Attorney's office, told the newspaper. "You can't tell if he actually made contact, but it's certainly reasonable to believe that it could have happened."
Student Kicked and Slapped
Texas teacher Sheri Davis was shown kicking and slapping a 13-year-old student for nearly a minute in a video taken by another student at a Houston charter school in April, 2010.
In an exclusive interview with "Good Morning America," Davis said that, at the time, she was trying to defend another student and had had her adrenaline pumping after breaking up a fight that happened minutes earlier.
"These kids are just, basically, laying around on the floor, just being hostile. And this young lady was in the middle of the floor. The door was locked shut and the kids were there, kind of mimicking her. This particular young man, Isaiah, was bouncing around in a threatening, bullying position," Davis said. "I have adrenaline that is already building up with the fight that just happened minutes before."
Davis said she and other teachers were not properly trained on how to handle students at the school. The school denied the allegation, saying that nothing like the Davis incident had ever happened before.
Davis, who had been named the school's teacher of the year twice, was fired after the attack and was charged with injury to a child, a third-degree felony. She pleaded no-contest to the charge, was sentenced to five years' probation and ordered not to work as a teacher during that period, The Houston Chronicle reported.
ABC News' Christina Ng and Ed Lovett contributed to this report