West, the baby's mother, has said she and her son were walking home from the post office, a few blocks from her apartment, when they were approached by two youths asking for money. She said she told them she had none, and an older teenager drew a handgun and asked her: "Do you want me to shoot your baby?"
She said the gunman shot her in the leg, and another bullet grazed her left ear, before he shot her baby in the face. West and the boy's father had just celebrated Antonio's first birthday in February.
West identified De'Marquise Elkins as the shooter when police showed her a photo lineup of 24 faces, she said.
Police also arrested 15-year-old Dominique Lang on murder charges. Lang still needed an attorney appointed to defend him when he made his first appearance before a judge Monday.
West has said she's certain Elkins was the shooter. She said the younger boy mostly hid behind him.
Kevin Gough, a public defender representing De'Marquise Elkins, said Tuesday that defense attorneys are looking closely at possible alibis for the suspect. Gough also said it's tough to persuade a jury with an alibi defense in a small city such as Brunswick. Elkins' aunt lives less than 2 miles from the crime scene.
"We believe very strongly in his innocence," Gough said of De'Marquise Elkins.