Patrick Hickey pleaded not guilty this morning to three counts of criminal sexual conduct in Lenawee County, Michigan, Toledo news outlets report.

Hickey, a former Findlay High School assistant principal, is accused of having sex with a 15-year-old in 1987, when he was a teacher and girls basketball coach at Addison High School in Addison, Michigan.

The third-degree felony charges, which are each punishable by up to 15 years in prison, were filed Tuesday.

On Tuesday, Hickeys attorney Lorin Zaner said his client would resign from Washington Local School District board in Toledo.

He was elected last November. Previously, he had been Washington Locals superintendent. He resigned from that position in 2015, leaving before the school board could consider firing him based on the findings of a law firm, according to the Toledo Blade. The firm alleged that Hickey had not told Washington Local about the circumstances under which he left Addison High School.

Before that, Hickey had been the assistant superintendent, the position he left Findlay City Schools to take.

Hickey was an assistant principal at Findlay High School from August 1996 to August 2002.