Both girls were struck by a car and killed September 29, according to local authorities. And now another teenager – whom the Union County Prosecutor’s Office identified as a 17-year-old male – has been arrested and charged with two counts of first-degree murder. The date and location line up with the details of the hit-and-run alleged by the prosecutor’s office. The suspect was detained and questioned on Monday, according to the Union County Prosecutor’s Office. He was released and then arrested on Wednesday morning, the prosecutor’s office said in a statement to CNN.