MANSFIELD (CBSDFW.COM) – A Mansfield Summit High School teacher has resigned after allegations he followed and assaulted one of his teenage students.

Mansfield ISD spokesman Richie Escovedo confirmed the teacher resigned, but did not know when. He would not say if the district had suspended the teacher, or opened up any investigation into his actions before the resignation.

The father of the 17-year-old alleged victim in the case told CBS 11 his daughter was in a basic computer skills class that the man taught. He also coached at least one sport according to the school’s website.

The girl’s father said the 36-year-old man started following his daughter’s Twitter account this spring, then began sending her dozens of private text messages. He also appeared at one of the girls athletic events he said. The father said Easter Sunday, the teacher showed up at the business where the girl works in Arlington. The father said the man blocked her from getting into her car and she had to get the attention of bystanders to get away. Arlington police said they were not called to the business that day.

The father said it was more than a week later that his daughter opened up to another staff member at the high school about what was happening. Mansfield ISD police are aware of the allegations and are investigating the father said. MISD police did not immediately return a request for information on the case. The former teacher could not be reached for comment Monday.