MARIETTA, Ga. – An 18-year-old man accused of fatally shooting a baby in a stroller during a robbery attempt in coastal Georgia twice counted down from five and threatened the baby before the deadly shot, his teenage co-defendant testified Thursday. Dominique Lang took the stand at the murder trial of De'Marquise Elkins, who is accused of shooting 13-month-old Antonio Santiago on March 21. Police say the 15-year-old Lang was an accomplice, and he is also charged with murder and will be tried at a later date.