More details have emerged about the "hero" bystander who intervened within minutes of a gunman opening fire at an elementary school in Oregon.

Kaylub Giamanco, 36, fatally shot the 16-year-old gunman who killed four people at Silver Rail Elementary School in Bend, Ore. His actions "undoubtedly saved people," police said.

Giamanco, a carpenter and father of two girls who attend Silver Rail Elementary, had gone through "military shooting drills" with veterans who fought in Iraq, The Guardian reported.

Seeing the shooting unfold, Giamanco "pursued" gunman Griffin J. John II, his mother, Kenda Freeman, told CBS News.

Freeman said the experience has left her son traumatized. "I told him he was a hero, he did what he had to do, and that he did the right thing, and that I was proud of him and that he was a hero and he saved a lot of lives."

"Kaylub knew something was not right, so he pulled up onto the grass, grabbed his gun and basically stalked the gunman back into the school," Freeman said. "He crawled through a window that the gunman had shot out. He army crawled through the window."

Giamanco, who legally owns and carries his weapon, doesn't wish to speak about the school shooting because he feels "riddled with guilt" for not being able to save more lives, his brother, Kyle Giamanco, told the New York Post.

A teacher in the classroom had already thrown her cellphone at John, tackled him and fought him, police said. She was not injured. Bend Police Chief Mike Krantz said her actions likely prevented more bloodshed.

Giamanco then fired at John multiple times with a legally owned .40-caliber pistol, killing him just before police arrived, officials said.

Oregon Gov. Tina Kotek praised the Bend resident at a press conference, without naming him, saying he "heroically intervened to stop further loss of life." Addressing him directly, she acknowledged the toll it had taken on him. "Your actions carry a heavy emotional burden, and I just want you to know that my thoughts are with you as well."

"I don't think we can underestimate or under-appreciate that courage," Krantz said Friday, speaking about the teacher and the man who shot the gunman. "When someone is willing to risk their own life for others, we recognize that. And the quick thinking to … follow someone into the school is incredible, and undoubtedly saved people."

The gun used by the 16-year-old shooter Griffin J. John II was purchased by his mother as a birthday gift, according to reports.

The Maverick 12-gauge shotgun was purchased legally in August 2026 by the mother of the gunman who carried out the shooting, and given to him for recreational use, sources told CBS News.

On Friday, two senior law enforcement officials told NBC News that John's mother bought the shotgun and has been cooperating with investigators.

The shooter killed Rhoam Summer, a 5-year-old student, and Megan Lambert, a 25-year-old teacher from Bend, along with two other children aged 8 and 11 on Thursday. Police said all of the shots were fired inside a single special needs classroom.

In an interview with CNN on Sunday, John's mother said that "there were no warning signs" and wouldn't comment on how her son got access to the gun used in the shooting.

Schools across Bend., Ore., will stay closed Monday and Tuesday as the community mourns four people killed on Thursday, when police say a 16-year-old former student opened fire in a special education classroom. Students return Wednesday on an early-release schedule, and Silver Rail will remain closed until further notice, the Bend Bulletin reported.

In a statement, Lambert's family described her as a native central Oregonian who grew up in Bend and had a passion for playing sports, especially volleyball.

"Her goal was to be an educator and teach in the school district she loved growing up in," the statement continued. "Silver Rail was her first job as a teacher. … She loved Silver Rail. This was her dream job. Megan was compassionate and had a huge heart. She always fought for the underdog and those with special needs. She was an incredible sister, daughter, niece and granddaughter. … She was funny and opinionated and she lit up the room."

Megan Lambert, 25, a teacher at Silver Rail Elementary School in Bend, Ore., was killed in Thursday's shooting.

Rhoam Summer, 5, was one of three children killed in Thursday's shooting at Silver Rail Elementary School in Bend, Ore.

The shooter was identified as Griffin J. John II. He was a former student at the school who had received special ed services, according to Bend-La Pine School Superintendent Steven Cook. The Confederated Tribes of Siletz Indians confirmed Saturday that John was an enrolled member, NBC News reported.

A 7-year-old girl who received lifesaving care at the scene was in serious but stable condition at Oregon Health & Science University, police said. A 54-year-old teacher, Becky Drury of Bend, suffered serious but non-life-threatening injuries and was being treated at St. Charles Bend. Her family allowed police to release her name.

Becky Drury, 54, a teacher at Silver Rail Elementary School, was injured in Thursday's shooting.

According to a Facebook post from her mother-in-law, Drury has already had surgery to repair significant damage to her left arm and will need more surgeries in the future. She also suffered injuries to her right hand, but none of her wounds are believed to be life-threatening.

"The good news is she will be ok and we all get to keep that magnificent woman we love so much in our lives," the post read. Her husband, Will Drury, said her left arm "took a lot of damage" and that her right hand also needed surgery, CNN reported.

The two other children killed, both boys, were 8 and 11. Their families asked police not to release their names.

Other than John's past association with the school, police did not share any information on the potential motive behind the shooting.

"Everyone wants to know why, including us," Krantz said. "We may never get that full answer, but we want it."

Flowers are placed beside a sign at Silver Rail Elementary School in Bend, Ore., on Friday.

Krantz provided new details about what happened in the chaotic few minutes from when John first opened fire outside the school to when he was killed.

According to Krantz, John approached the school at approximately 12:58 p.m. on foot before throwing his gun over an exterior fence and climbing onto the school's property. 

A driver in a red pickup truck spotted John and "verbally confronted" him from inside their vehicle. John fired at least three rounds at the truck before heading inside. The driver, who was unhurt, quickly called 911 to alert police.

John then walked around the outside of the school and fired multiple rounds into the glass panes of an exterior door to gain access to the school. He then turned left into a special education classroom and immediately began firing. In total, John fired as many as 15 rounds, Krantz said. 

Officers arrived at the scene within three minutes of the first 911 call. "Seconds later, officers reported the suspect had been shot and killed, possibly by a bystander," police wrote in an incident report on Thursday. Officers then cleared the school, and all students and staff were transported to a nearby church for reunification with families and guardians.

According to Krantz, John was carrying an additional 44 rounds of ammunition when he was killed.  

No other students other than the three who were killed and the one who was injured were in the classroom at the time, Krantz said. There was no School Resource Officer present at the school.

Investigators have searched John's home and plan to keep control of the school until at least Tuesday to finish collecting evidence, police said. They are asking anyone with video of a teenage boy in black clothing and a black backpack near Third Street, Brosterhous Road or the school between 10 a.m. and 1 p.m. Thursday to submit it. The FBI has set up a tipline at 1-800-CALL-FBI and fbi.gov/silverrailschool.

People leave a family reunification area following a shooting at Silver Rail Elementary School in Bend, Ore., on Thursday.

Rhoam Summer's parents, Kelik and Lillian, released a new statement on Monday through their attorneys providing more details on who he was and how best to honor his memory. 

"Rhoam was so so strong. The day he was born, his father gave him his first sink bath at the hospital. In the sink, Rhoam grabbed his dad's hands and pulled himself up with his own strength. He climbed a ladder (3 step stool) when he was just 6 months old. He never stopped moving. He never stopped climbing. He could do anything," they wrote in the statement shared by the law firm Dwyer Williams & Cherkoss.

A GoFundMe set up by friends of the family, one of 10 fundraisers that the site has verified to support those connected to the shooting, has raised more than $187,000 as of Tuesday. 

In their statement, the Summers said another way to remember Rhoam is to embody the spirit he lived with. 

"If people want to memorialize our little Rhoam, we request you draw. Sharks, dinosaurs, monsters... Rhoam loved to tell stories of creatures with big teeth who needed understanding and friendship. Please make art for him. Draw or paint. Use your hands if you can. Get messy," they wrote. 

Dwyer Williams & Cherkoss is one of three law firms the Summers have reportedly hired to "preserve and protect Rhoam's memory and investigate possible legal claims arising from the mass school shooting," according to the Salem Statesman Journal. 

"Senseless, barbaric, and depraved? Yes. But was it foreseeable and thus preventable?" Tim Williams, cocounsel on the investigation, told the paper. "That's what we will find out. While law enforcement handles the criminal prosecution, we will be investigating any systemic failures that may have allowed this tragedy to happen. We are committed to holding all responsible parties accountable to ensure a tragedy like this never happens again and justice is done in Rhoam's name."