DOUGLAS COUNTY, Colo. (CBS4) - On Monday, Jurors in Devon Erickson's murder trial heard testimony from two of his friends about his behavior before the shooting at STEM School Highlands Ranch in 2019.

On Tuesday, jurors in Devon Erickson's murder trial saw body camera video from deputies who responded to the shooting at STEM High School Highlands Ranch in 2019.

Devon Erickson appears in court at the Douglas County Courthouse in Castle Rock, Colo., on May 15, 2019. The former high school student was convicted of first degree murder and other charges for ...

The felony murder trial of Devon Erickson, accused in the 2019 STEM School Highlands Ranch shooting that left one student dead and eight others injured, opened Thursday with prosecutors saying he w… ...

Judge Theresa Slade sentenced Devon Erickson on Friday to life in prison plus 1,282.5 years for his role in the May 7, 2019 murder of Kendrick Castillo at STEM School Highlands Ranch and the ...

A women wears a Kendrick Castillo shirt at Douglas County District Court in Castle Rock on June 15, 2021. Devon Erickson has been found guilty of first-degree murder in Kendrick’s 2019 death.

Devon Erickson, then 18, and Alec McKinney, 16, entered STEM School Highlands Ranch near Denver on May 7, 2019, and opened fire. Kendrick Castillo, an 18-year-old student, was killed and eight ...

Devon Erickson, 18, will have his first court hearing Wednesday, when prosecutors will announce initial charges against him. He’s expected to be slapped with 30 counts, including one count of ...

A Douglas County jury on Tuesday convicted STEM School Highlands Ranch shooter Devon Erickson of nearly four dozen charges, including three counts of first-degree felony murder for killing classmate ...

Devon Michael Erickson, the accused STEM School shooter, appears at the Douglas County Courthouse for his advisement hearing in Castle Rock, Colo., Wednesday, May 8, 2019.

Devon Erickson: 5 Things To Know About Adult Suspect, 18, In Denver School Shooting. High schooler Devon Erickson has been named by police as one of the suspected gunman who shot nine at STEM ...

Erickson also shared a pro-Obama post from Occupy Democrats in 2015. “In just six years I nearly tripled the stock market, cut unemployment in half, ended two wars, cut the uninsured rate in ...