NEWINGTON — A woman who worked as a special education tutor in the Newington school system has been charged with eight counts of second-degree sexual assault after engaging in a sexual relationship with a 20-year-old student.

Newington school officials notified police of the allegations on June 13 and on Monday police announced they’d arrested Amy Belliveau, 43, of New Britain. Police said she turned herself in Thursday after learning a warrant had been issued for her arrest.

It is against state law for a school employee to have sexual contact with a student, regardless of age of the student.

Belliveau has been fired from her position. The sexual contact occurred between April and June of 2013, police said. The victim was a student at the Newington Transitional Academy, police said.

Schools Superintendent William C. Collins said the district worked jointly with police after they began to suspect a sexual relationship had occurred. Collins said he was “thrilled” that an arrest was made.

The 20-year-old student was a “high-functioning” special needs student, he said.

Belliveau was placed on administrative leave as soon as the investigation began and then terminated after the arrest. Collins said she was in her first year of teaching in the district.

She posted $10,000 bail and is due back in court Oct. 9.