Antonio Santiago Shooting Update: Information from suspect's mother, aunt leads police to gun, link sought to baby's killing

(CBS) Police say new information from the mother and aunt of a suspect in last Thursday's deadly shooting of a Georgia baby led them to a handgun submerged in a body of water.

PICTURES: Ga. baby fatally shot in stroller

Glynn County Police Chief Matt Doering said investigators located the weapon Tuesday after arresting 36-year-old Karimah Elkins, the mother of De'Marquise Elkins, and 33-year-old Katrina Elkins, his aunt, for making false statements to police. Doering says after their arrest, the women made additional statements which led investigators to witnesses and eventually to the weapon, which was found in a small pond.

Police are still trying to determine if the weapon is connected to the shooting.

Both women have reportedly posted $1,104 bail, but only Karimah Elkins was released because Katrina is being held on a probation violation charge. 

De'Marquise Elkins, 17, and a 15-year-old are charged as adults with murder in the shooting of 13-month-old Antonio Santiago while he was in his stroller on a walk with his mother, Sherry West, who was also shot. Both teens made their first court appearances Monday.

Katrina Elkins told reporters Saturday that her nephew couldn't have killed the child because he was at her house having breakfast, according to The Associated Press.

Complete coverage of Antonio Santiago's shooting death on Crimesider