RADNOR, Pa. (CBS) – An employee at Archbishop Carroll High School has been charged for allegedly sexually assaulting a former student, the Delaware County District Attorney’s Office announced. Thirty-three-year-old Christopher Serpentine was arrested Wednesday.

Police say Serpentine had an inappropriate relationship with a student between April and June 2017 while he was the school’s director of communications. According to authorities, the victim came forward last month.

Serpentine, the school’s theater director, is charged with four counts of institutional sexual assault, officials say.

He is the second Archbishop Carroll High School employee arrested on sexual assault charges in the past three months.

The school released a letter to the community Wednesday night, that read, in part, “Recently, school administration received notification through a third party that concerns regarding Mr. Serpentine’s interactions with students had been reported. This notification instructed us to monitor his activity on school grounds. Out of an abundance of caution, we placed him on administrative leave and entirely restricted his access to campus. Last week, we were contacted by the Radnor Township Police Department in connection with this matter.”

The school says Serpentine passed a criminal record check, as well as child abuse clearances before he was hired.

“We fully realize that recent weeks have been challenging ones for all members of our community,” the statement continues. “Please know that we will take all possible steps to support our students and school families. We are encouraging our young men and women to speak with counselors should they need those services. In the coming days, we will monitor the situation at school to ensure that we are providing all possible modes of support.”

If you know any information about the alleged incident, call police at 610-688-0500.