Erickson was expected in Douglas County District Court in nearby Castle Rock at 1:30 p.m. MDT (1830 GMT).
"The [STEM] school is literally two minutes away from where I live, right down Broadway in Highlands Ranch", Malone said according to ESPN.
Officers and teachers evacuating students at the school.
Spurlock said earlier that one suspect is an adult male and one is believed to be a juvenile.
In the initial confusion, eighth-grader Karthik Selva said they heard yelling and others in his room thought it was students yelling and it was a joke.
They have named one of the two suspected shooters, 18-year-old Devon Erickson. The tragedy left one student dead and eight others injured.
Spurlock said that three of the wounded remain in intensive care but the other five students have all been released from local hospitals.
Deputies responded around 1:50 p.m.to the school, which is near a sheriff's department substation, and officers got there nearly immediately, Nicholson-Kluth said.
None of the victims had been identified as of Tuesday evening. "There were a number of students that were shot and injured".
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A 22-year-old former student of the university has been charged with murder and attempted murder in that case.
Colorado Governor Jared Polis tweeted he would send extra police officers to the scene. It was particularly slow after last year's shooting Marjory Stoneman Douglas High School in Parkland, Florida.
President Trump has been briefed on the school shooting that unfolded in a Denver suburb, resulting in one death and eight injuries, the White House said Tuesday.
The school was placed on lockdown after the shooting, and parents were being directed to meet their children at Northridge Rec Center at 8800 S. Broadway. It's not just Colorado.
He says "we originally thought the juvenile was a male by appearance". "But this is proof it can happen anywhere".
The mother, who was not identified, recalled getting a terrifying phone call from her daughter. Douglas County Schools were also closed April 17 as authorities scrambled to find an armed Florida teen they said was infatuated with the Columbine massacre. The school, her family said, promotes kindness at every level. "I just wanted to make sure I acknowledged what happened today, in my backyard, and that all of those families are on my mind". They are still clearing the school.
"Dad", Larry recalled him saying, "there's a lot of blood". She was heading home on C-470 when about 15 police cars rushed by, sirens on, from multiple jurisdictions.
"They were seriously doing everything in their power to get to STEM as fast as they could", she said.
A source told Denver7 that investigators were using a bomb robot near one of the suspect's vehicles because tactical gear was found inside. Parents all gathered outside.
"It is not just Highlands Ranch".