MARIETTA, Ga. – A young man fatally shot a 13-month-old baby in a stroller in coastal Georgia when the child’s mother did not immediately hand over her purse, a prosecutor said on the first day of the man’s murder trial Tuesday, while a defense attorney suggested to a jury that the child’s parents were somehow involved in the slaying.

De’Marquise Elkins is charged with murder and other offenses in the March 21 killing of the toddler, Antonio Santiago.

“The young man took the gun and aimed it at Antonio’s head and shot him right between the eyes,” Brunswick District Attorney Jackie Johnson told jurors.

If convicted, Elkins will not face the death penalty because he was 17 at the time of the killing, too young under Georgia law to be executed.

The child’s mother, Sherry West, was shot in her leg while another bullet grazed her ear. Prosecutors have also accused Elkins of shooting Wilfredo Calix Flores outside a local church 10 days before the child was killed.

The killing this spring in the port of city of Brunswick, close to vacation spots like Jekyll Island, drew national attention, and the trial was moved to the Atlanta suburbs because of the extensive publicity the case received locally. In opening statements, Johnson told jurors that both shootings started off as robberies.

“When it didn’t happen immediately, as Mr. Elkins thought it should, his reaction was to shoot,” Johnson alleged.

The prosecutor said Elkins and an accomplice, 15-year-old Dominique Lang, stopped the mother and child as they returned home from the post office. Johnson said that Elkins pointed a small .22-caliber revolver at West and demanded her money. West did not immediately hand over her purse and the child was shot.

Bystanders and rescue workers were unable to revive the child, who was pronounced dead at the scene.

Lang is also charged as an adult with murder but will be tried separately. Authorities said Lang identified Elkins as the shooter and is expected to testify at the ongoing trial.

Defense attorney Jonathan Lockwood suggested that Antonio’s parents were somehow involved in his death, though he did not provide a precise motive or further explain that theory. He said that no one in the neighborhood saw or heard anyone fleeing the scene of the shooting.

He also questioned whether police focused their investigation too soon on the wrong suspects. He said that West tried to collect on a life insurance policy shortly after her son’s death.