MARYVILLE (WATE) – The boys’ basketball coach at Heritage High School has announced his resignation amid an internal investigation by the school system.

Bill Duncan’s resignation took effect on Wednesday. Blount County Schools spokesperson Marla Holbert says Duncan was originally placed on administrative leave with pay last month.Previous story:Heritage High School boys’ basketball coach suspended

The nature of the investigation has not yet been disclosed. Duncan’s personnel file did not reveal any details. Blount County Sheriff’s Office spokesperson Marian O’Briant says her office is involved in the investigation but could not release any details.

Duncan had been the Heritage High School basketball coach since 2012. He previously coached at Greeneville, Seymour, Scott and Portland.