EVERGREEN — The 16-year-old boy who shot two schoolmates and then himself at Evergreen High School on Wednesday after authorities say he was “radicalized by some extremist network” appeared to support white supremacist views online and showed an interest in mass shootings in the days before the attack.

The shooter, Desmond Holly, died from a self-inflicted gunshot wound, according to the sheriff’s office. Investigators believe he opened fire just before 12:30 p.m. at the school at 29300 Buffalo Park Road, wounding two other students.

The two victims remained in critical condition Thursday at Denver-area hospitals.

Social media accounts that appear to be connected to shooter Desmond Holly are littered with references to mass shootings and antisemitic views.

In one photo posted five days ago on TikTok, Desmond appears to be wearing a black T-shirt with the word “Wrath” written in red across the chest – similar to what one of the attackers wore in the 1999 massacre at Columbine High School, also in Jefferson County. The same post also includes an image of the 15-year-old who killed two people and injured six more at a Madison, Wisconsin, school in December.

A post on X about an hour before Wednesday’s attack shows an image of a hand holding a revolver – the type of weapon that authorities confirmed Desmond used during the attack. Representatives for the sheriff’s office did not answer specific questions about the social media accounts.

The accounts also include references to Holocaust denial, and the name on the TikTok account appeared to end with a reference to a prominent white supremacist slogan. That account reposted several videos showing school shooting scenes from movies, as well as another video that appeared to show the two Columbine shooters taking target shots at bowling pins. Other videos the account reposted were explicitly antisemitic or depicted people in Nazi uniforms.

Desmond lived with his family in a sprawling mountain home on a private lane outside Kittridge, property records show. His parents and other relatives did not return requests for comment Thursday. A road to the family’s house was blocked by a gate more than half a mile from the property.

On Wednesday, Desmond rode the bus to school, Kelley said.

It was not immediately clear how he accessed the revolver he used in the attack or how he kept it hidden until midday.

Desmond brought “quite a bit of ammunition” with him, Kelley said. Authorities are still working to determine whether he targeted specific students, but noted he fired his gun many times throughout the school, she said.

“He would fire and reload, fire and reload,” Kelley said. “This went on and on. He tried to find new targets. He came up to a roadblock on many of those doors – he couldn’t get to those kids.”

Kelley said Desmond’s parents have cooperated with the investigation. Authorities are considering whether they could face criminal charges related to the attack or Desmond’s access to the gun.

“We have windows shot out, lockers shot up,” she said. “We are finding unspent rounds. It is a huge area… He fired multiple, multiple times.”

Evergreen High student Kai Taylor, 15, fled the shooting and sheltered in a nearby neighbor’s home. The sophomore said he knew Desmond in middle school and used to talk with him on the school bus frequently.

Taylor said they lost touch over the years.

“Even so, to know that you talked to someone like that — it almost disgusts me,” Taylor said Thursday.