BANGOR, Maine — A former RSU 67 educational technician was indicted Wednesday by a Penobscot County grand jury on charges related to her alleged sexual relationship this summer with a 15-year-old male student.

Tammy L. Larlee, 45, of Lincoln was indicted on four counts of gross sexual assault, Class A crimes, and four counts of sexual abuse of a minor, Class C crimes.

Her arraignment date has not been set.

Larlee and the boy had sexual intercourse twice in June and twice in July, according to Alice Clifford, the Penobscot County assistant district attorney who is prosecuting the case.

Clifford said that because Larlee essentially had a teacher-student relationship with the victim, she was charged with the more serious crime of gross sexual assault.

Lincoln police discovered the alleged sexual assaults and abuse while investigating a separate incident, the prosecutor said Thursday. Clifford said it was unclear to her what Lincoln police were investigating that led them to Larlee.

Larlee worked for the district that includes Lincoln, Chester and Mattawamkeag from 1999 until last month, when she resigned, Ray Freve, superintendent for RSU 67 said Thursday.

Her last assignment was working at Mattanawcook Academy in Lincoln, he said.

Clifford said that Larlee met the victim while working at the school.

If convicted, Larlee faces up to 30 years in prison and a fine of up to $50,000 on the Class A gross sexual assault charges. On the sexual abuse of a minor counts, Class C crimes, she faces up to fives years in prison and a fine of up to $10,000.