The man police in Bend, Oregon, said “neutralized” the gunman in Thursday’s deadly shooting at Silver Rail Elementary School has been identified as 36-year-old Kaylub Giamanco, a law enforcement source confirmed to News Outlet. The attack killed three children and a teacher.

At a news conference Friday, police identified the slain teacher as 25-year-old Meghan Lambert. Officials also said one of the youngest victims was 5-year-old Rhoam Summer.

“Meghan was compassionate and had a huge heart. She always fought for the underdog and those with special needs,” Lambert’s family said in a statement read during the news conference. “She was an incredible sister, daughter, niece and granddaughter. Her friends became her family.”

Earlier Friday, Kenda Freeman said in a statement that her son, Giamanco, stepped in during the attack and shot the gunman who killed the three students and Lambert, The Associated Press reported.

Giamanco, a local carpenter and father, has two daughters who attend Silver Rail Elementary, his brother Kyle Giamanco told NBC News.

Kyle Giamanco said his brother remains shaken by the shooting and does not want to speak publicly.

Lambert’s family also expressed gratitude to the bystander who intervened, saying they understood he was enduring a difficult time and considered him a hero. “You selflessly put yourself at risk for others,” the family said, adding that the other victims’ families remained in their thoughts and prayers. “Meghan loved those children, and so we will show you love for her.”

The three students killed in the Silver Rail Elementary School shooting were 5, 8 and 11 years old.

This is a developing story. Please check back for updates.