Oregon elementary school shooter and man who shot him identified

John J. Griffin, 16, has been identified as the gunman in Thursday's deadly school shooting at a Bend, Oregon, elementary school. 

Three senior law enforcement officials identified the shooter who killed four people at Silver Rail Elementary, NBC News reported. 

Kaylub Giamanco, 36, was identified as the good Samaritan who took down Griffin, his brother, Kyle Giamanco, told NBC News. 

Kaylub Giamanco is a carpenter and the father of two girls who attend Silver Rail. According to Kyle Giamanco, his brother was driving home for his lunch break when he heard gunshots. He then spotted the gunman entering the school. Kyle Giamanco also said his brother has a concealed-weapon permit and told him that the shooter had gone into the special education room. 

Kyle Giamanco said his brother is a hero, and he's avoided speaking publicly. Since he wasn't able save more lives, he doesn't feel like one, Kyle Giamanco said. 

Griffin's mother purchased the gun he used around the time of his birthday in August, according to two of the three senior law enforcement officials.