Attorneys for the teenager accused of murdering Lily Peters are striving to keep his case in juvenile court.
Both defense and prosecution have submitted briefs to the appellate court.
The suspect, who was 14 at the time, allegedly beat, raped, and strangled Peters as she walked home in 2022.
The case has experienced delays due to a judicial backlog and disputes over whether it should be tried in adult court.
A judge ruled in January that the case should proceed in adult court, with the trial set to begin soon.
