BALTIMORE (AP) — Baltimore police have arrested a 14-year-old boy in the slaying of a 16-year-old student at one of the city’s top public high schools.

Police said Wednesday that the boy has been charged as an adult with first-degree murder. He’s the third person to face charges in the death of Arnesha Bowers. She was sexually assaulted and strangled before her home was set on fire earlier this month.

Also facing charges are 23-year-old Adonay Dixon and 20-year-old John Childs. Police say the teenager admitted to participating in the sexual assault and killing of Bowers along with the two older men. Police say they believe the crimes were committed as part of a gang initiation.

Bowers was a student at Baltimore City College, a magnet high school.