BRUNSWICK, Ga. — The mother of a baby gunned down in his stroller says she has no doubt a teenage suspect jailed in the slaying is the man who killed her 13-month-old son, but family members say he wasn't anywhere near the scene.

"That's definitely him," Sherry West said when she saw the jail mugshot of 17-year-old De'Marquise Elkins, who is charged as an adult with first-degree murder. Police also arrested a 14-year-old who has not been identified because he's a minor.

"We're trying to determine which one actually was the shooter," police spokesman Todd Rhodes said Saturday.