A former employee at a Washington State high school was charged Thursday afternoon with allegedly raping a 15-year-old student.

Kristal M. Gamble, 33, was employed as an office assistant at Kent Meridian High School when she allegedly initiated an illegal sexual relationship with a boy last spring.

According to Detective Melanie Robinson, the boy’s parents allegedly found sexual photos and messages on their son’s cellphone, so they contacted the Kent Police Department in September.

By that time, Gamble was no longer working for the Kent School District, according to a spokesman.

Gamble was arrested Wednesday. She is being held at the Norm Maleng Regional Justice Center with bail set at $10,000.