Flowers are left at a memorial outside the Silver Rail Elementary School in Bend. (EPA Images pic)BEND: The "hero" who shot dead a teenage gunman after he had already killed three children and a teacher at an elementary school in the US state of Oregon was named Friday by his brother.

Kaylub Giamanco raced into Silver Rail Elementary in Bend after the shooter, identified by local media as 16-year-old John J. Griffin II, blasted his way through locked doors and opened fire on youngsters.

Kyle Giamanco said 36-year-old Kaylub, who has two children at the school, was driving home for his lunch break when he heard gunshots and saw Griffin going into the special education room of the school.

Kaylub Giamanco has a permit to carry a concealed weapon, his brother told NBC, adding that he was having difficulty processing events at the moment and feels guilty that he did not save more people.