Jaylen Fryberg 14, shot and killed a girl in the attack at Marysville Pilchuck High School on October 24, She has not yet been formally identified.
Three other students targeted by Jaylen Fryberg -including two of his cousins remain in hospital. Two are in a critical condition.
All were shot in the head after the Fryberg pulled out a weapon and started firing in the school cafeteria. Law enforcement sources said Fryberg used a .40-caliber Beretta handgun. Officials said the gun was legally acquired, but did not say if Fryberg was the owner.
It was unclear whether Fryberg had killed himself deliberately or whether the gun had been fired by accident as he struggled with the teacher.
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