Police say Elkins' alleged accomplice, 15-year-old Dominique Lang, has told investigators that Elkins fired the gun. Lang also is charged as an adult with murder but will be tried later. He's expected to be a key witness against Elkins.
Both prosecutors and Elkins' defense attorneys declined to comment before the trial, citing a gag order by the judge. The boy's mother also declined to talk.
Kevin Gough, a public defender who is Elkins' lead attorney, has strongly suggested in pretrial motions that the real killers are the child's own parents.
Defense attorneys also point to lab tests by the Georgia Bureau of Investigation that found traces of gunshot residue on swabs taken from the hands of West and the boy's father, Louis Santiago. Reports filed in court say the GBI found a single microscopic particle of gunshot residue swabbed from the father's hands, while more than five particles showed up in swabs from West's hands.