The killing in the port city of Brunswick drew national attention, and the trial was moved to the Atlanta suburb of Marietta owing to extensive publicity locally.
Prosecutors have said information from Elkins' mother and sister led investigators to a pond where they found the revolver. Elkins' sister also was charged with evidence tampering.
Lang, who was a key prosecution witness in Elkins' trial, is set to go to trial at a later date. De'Marquise Elkins' attorney asked for bond for his client while they appealed, which the judge denied.
The defense tried throughout the trial to prove that the investigation was flawed and that police refused to consider other leads or investigate further once they had Elkins in custody the day after the killing.
"They finished their case in 25 hours. Everything else they did after that they just sugarcoated," defense attorney Jonathan Lockwood said.
The prosecution's witnesses many with a criminal history and some drug users lied repeatedly and changed their stories throughout the investigation, Lockwood said. The defense also said several law enforcement agents backtracked in their testimony to make sure what they were saying fit the state's version of the story.
The baby's mother, Sherry West, made different identifications of the suspect and behaved strangely after the shooting, occasionally joking and laughing while being questioned by police and making other bizarre statements, Lockwood said. The baby's father, Louis Santiago, was in the vicinity when the shooting happened and showed no warmth toward the child's mother afterward, Lockwood said.
Lang testified that Elkins is the one who asked West for money and fired the shots, but admitted lying repeatedly, Lockwood said. And Lang's cousin, Joe Lang, was in the area on the day of the shooting and fits the description of the shooter.
But police never really investigated the baby's parents or the Lang cousins, Lockwood said.
The defense had strongly suggested in pretrial motions that the baby's parents were the killers. Lead defense attorney Kevin Gough, a public defender, made several suggestions to the same effect during the trial. But much of his questioning that seemed to be heading in that direction including attempts to bring up details about the backgrounds of both of the baby's parents was blocked by the judge after the prosecution objected.
Prosecutors said the defense presented a lot of theories and speculation but that the evidence and facts in the case proved Elkins' guilt.