The mother of a Cobb County teen who lost her son to an accidental drowning while on an international school trip to is filing suit against the school district, attorneys confirm.

Last year, North Cobb High School freshman Tomari Jackson and his classmates traveled to a wildlife sanctuary in Belize over the winter break and were on an excursion.

Thirty-two students and six chaperones were on the trip, which was intended to be an educational excursion to provide experiential learning for students in the NCHS magnet program. After a hike, students and chaperones were swimming in shallow water near a river bank, when Jackson went missing for an hour. A sort search by local authorities confirmed a parent's worst nightmare -- that Jackson had died.

The Cobb County School District offered condolences after the tragic accident, but more than a year later, Jackson's mother is filing a lawsuit against the district, calling her son's death a result of "gross negligence of those entrusted with keeping a group of Cobb County students safe."

Adell Forbes, Jackson's mother, filed the suit in with the Cobb County court system.

Forbes' attorney Tricia Hoffler issued a statement, calling the whole incident "unthinkable."

"His death, albeit tragic, was completely preventable and avoidable with reasonable precautions," Hoffler said. "“When parents send their children on this type of field trip to a foreign country, they have the reasonable expectation that the chaperones, the school and the organizers will do everything in their power to keep the children safe."

11Alive reached out to the Cobb County School District for a response, but was told the district does not comment on pending litigation. Forbes and her attorneys plan to hold a news conference Friday in regards to the case.