Derek Michael Boyce, 37. Credit: Lisbon Police Department

A Maine teacher has been indicted on 26 sex charges involving a student.

Derek Boyce, a 37-year-old who teaches at Pine Tree Academy in Freeport, was charged in September with multiple counts of gross sexual assault, unlawful sexual contact and sex abuse of a minor after police say he engaged in sexual acts with an underage student for months.

A spokesperson for Pine Tree Academy said in September Boyce was placed on administrative leave and the school believes this is an isolated incident.

According to court documents, the victim’s mother told police she had gone to the school earlier this year because she was concerned Boyce was spending too much time alone with her daughter. She said administrators were also concerned and talked to Boyce about it.

Pine Tree Academy offers “Christ-centered” education to students from pre-kindergarten through 12th grade, according to the school’s website.