(CHICAGO) A 15-year-old boy who turned himself in to police has been charged as an adult with the sexual assault of a 41-year-old woman on a Blue Line train on Monday afternoon.

Deshawn Isabelle faces one count of aggravated criminal sexual assault and one count of robbery, both felonies, according to Chicago Police and the Cook County state’s attorney’s office. He is scheduled to appear in bond court Thursday.

About 9:30 a.m. Wednesday, the teen—whose named was not released by police because he is a minor—went with his guardian to turn himself in to police after seeing his picture in the media, police said.

About 3:10 p.m. Monday, the 41-year-old woman got on an eastbound Blue Line train at the Oak Park Avenue station, police said. Soon after, a male who got on the train at the Forest Park station attacked her from behind.

He knocked her to the ground, sexually assaulted her and then robbed her of her iPhone and cash, police said.

After the attack, he got off the train at Cicero. He then rode a westbound train back to the Austin station, police said.