Preliminary ballistics testing did not match the bullets recovered from the deceased bystanders to that weapon. They have not indicated who might have fired the bullets that killed the bystanders. The King county prosecutor’s office has charged the 15-year-old with first-degree assault with a firearm enhancement and unlawful possession of a handgun by someone under 18. If convicted in juvenile court, he could face two and a half years in juvenile detention. In adult court, a conviction would come with a penalty of about eight to 10 years in prison, and another possible five years for the firearm enhancement.