Prosecutors allege Myers went back to his car after a confrontation and then fired into a group of mostly unarmed teenage girls.
Associate District Judge Richard W. Kirby considered testimony from five mental health experts over a four-month period before rejecting a motion by defense attorneys to have Myers certified as a juvenile.
“The court finds compelling the testimony of each of the mental health experts in this case and that none of these professionals recommend that the defendant be certified as a juvenile,” Kirby wrote in his ruling.
If convicted as a juvenile, Myers could be released on his 19th birthday, regardless of whether he completes a treatment plan.
Myers is due back in court June 26.