CHICAGO (CBS) — Oak Park and River Forest High School history teacher and assistant football coach Timothy Fischer has been fired, over allegations misconduct involving students.

Fischer, a tenured faculty member at OPRF, had been placed on leave last month.

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Oak Park and River Forest High School spokeswoman Karin Sullivan confirmed the District 200 school board voted to fire him “based on an inappropriate relationship and conduct with District students.”

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Officials have not provided any details on the misconduct allegations against Fischer.

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In a letter to parents last month, the school told parents an unnamed teacher had been placed on leave, after rumors circulated about his absence.