WESTBROOK — An assistant principal who had been placed on administrative leave returned to work at Westbrook High School on Thursday.

Howard Jack, who was publicly criticized by a student for a lack of response to bullying complaints, was placed on paid leave on June 5 “pending the outcome and findings of an internal investigation specific to a school-related matter,” Superintendent Marc Gousse said earlier this month.

Gousse said today that the investigation has been completed but that he could not comment on the findings until after a 30-day appeal period, which will end July 20.

Gousse said Jack could appeal any action taken by the administration to the Westbrook School Committee.

When reached by email, Jack declined to comment.

Gousse hasn’t said whether the investigation was related to complaints made by high school junior Victoria Pabst, who last month made public a letter she wrote to Jack about the bullying she was experiencing at school. She said her complaints weren’t acknowledged until other teachers got involved.

Jack has been an assistant principal at Westbrook High School since 2003.