A 14-year-old girl has died after being critically injured when a fellow high school student went on a shooting rampage last week in the US.

Shaylee Chuckulnaskit's death follows that of 14-year-old Gia Soriano, who died last weekend at the same hospital.

Another victim, a boy, remains in critical condition after being shot in the head.

One girl was killed instantly in last week's shooting, which ended when gunman Jaylen Fryberg turned his weapon on himself.