Tommy Collins, 36, was indicted on charges of murder and three counts of aggravated assault in the stabbing death of 14-year-old Reuban Hand.
MARTA police said a fight just outside the fare gates on the Peachtree Street side of the station led to the teenagers killing.
Deunya Taylor, Reuban Hands mother, said a man angry about a missing cellphone suddenly approached her son and stabbed him in the neck.
Police did not give a motive for the slaying, only saying that the incident remains under investigation.
Collins was taken into custody shortly after the incident.
The case will now be assigned to a Superior Court judge and scheduled for trial.
“Everybody loved him. You know, he touched everybody,” Taylor said. “I really just still dont believe that my babys gone.”