A former Dominican High School teacher accused of having an inappropriate relationship with a student was found dead Monday of an apparent suicide, authorities said.

A Dominican graduate recently alleged that there was an inappropriate relationship with Christian Tomsey, an English teacher, in 2009, according to a letter the school sent to parents Monday.

"Upon learning of the allegation, our administration immediately conducted a thorough investigation into the situation, which resulted in the termination of Mr. Tomsey’s employment," officials said in the letter.

Whitefish Bay Police Chief Michael Young confirmed Tomsey, 39, was booked into Milwaukee County Jail last week on potential charges of sexual assault of a student by school staff and possession of child pornography.

Young declined to provide any more information Monday, saying the investigation was ongoing. School officials also did not share any other details for the same reason.

The school letter said officials had learned of Tomsey's death on Monday. Milwaukee police confirmed investigators were called to a "sudden death" and are investigating it as a suicide.

Dominican High School will have counselors available at the school and has encouraged students to contact the dean of students to set up an appointment by calling (414) 332-1170, ext. 160. The school also asked anyone with information related to the investigation to contact Whitefish Bay police at (414) 962-3830.

In the letter, school officials sought to reassure parents on student safety. Administrators regularly review policies and procedures on staff-student relationships and promptly investigate all allegations related to students, according to the letter.

"Our thoughts and prayers are with everyone impacted by this tragic situation," the letter stated.