A former DeKalb County police sergeant has been indicted in the 2011 sexual assaults of two teenage girls, authorities announced Wednesday, saying DNA evidence linked him to the case after nearly 15 years without an arrest. Cameron Livsey, 47, was a DeKalb police officer when the assaults occurred, District Attorney Sherry Boston said. He resigned from the department earlier this year. Boston said DNA collected following Livsey’s federal arrest matched evidence from the cold case. The indictment includes charges of rape, sodomy, kidnapping, armed robbery, aggravated assault and aggravated battery, as well as possessing a firearm during the commission of a felony. If convicted, Livsey could face life in prison, Boston said. The charges are allegations; Livsey has not been convicted in the case. The assaults happened Oct. 8, 2011, at Exchange Park in DeKalb County. The victims, then 16 and 17, were walking in the area when a man approached them, demanded their phones and money, and threatened them with a gun, Boston said. The girls reported that he sexually assaulted them before they managed to get away and seek help. Investigators collected evidence at the time, but the case went unresolved for years. Authorities said the DNA profile was later matched after Livsey was arrested in connection with a federal investigation involving child sexual abuse material. The DeKalb indictment was announced after that match. Police Chief Gregory Padrick said Livsey spent much of his career in patrol and was not assigned to investigate the case. “No officer is above the law,” Padrick said. Boston acknowledged the harm caused by the long wait for answers. “Cases like this shake our faith in the criminal justice system and the people entrusted to work within it,” she said. She added that the indictment reflected a commitment to pursue the case and hold people accountable, regardless of their position. Livsey’s attorney could not immediately be reached for comment.