• Video
  • Shop
  • Culture
  • Family
  • Wellness
  • Food
  • Living
  • Style
  • Travel
  • News
  • Book Club
  • Newsletter
  • Privacy Policy
  • Your US State Privacy Rights
  • Children's Online Privacy Policy
  • Interest-Based Ads
  • Terms of Use
  • Do Not Sell My Info
  • Contact Us
  • © 2026 ABC News
  • News

16-year-old STEM school shooting suspect to be tried as adult, judge rules

2:42
1 dead, 7 injured in shooting at STEM school in Colorado; 2 suspects detained
Courtney Harper/AP, FILE
ByClayton Sandell
December 05, 2019, 5:28 PM

A 16-year-old will be tried as an adult for his alleged role in a shooting at a Colorado school that killed one student and injured eight others, a judge has ruled.

Alec McKinney, 16, and Devon Erickson, 18, face multiple charges including first-degree murder after allegedly opening fire inside the STEM School Highlands Ranch near Denver on May 7.

Kendrick Castillo, an 18-year-old student who tried to confront the shooters, was killed.

A police officer hugs his kids after they were evacuated to the Recreation Center at Northridge after at least seven students were injured during a shooting at STEM School Highlands Ranch on May 7, 2019, in Highlands Ranch, Colo.
Michael Ciaglo/Getty Images, FILE

Related Articles

(MORE: 'There's never a safe place': Colorado school training kindergartners to high schoolers to respond to an active shooter)

Judge Jeffrey K. Holmes on Wednesday rejected a request by McKinney's attorneys to try the teenager as a juvenile.

"Based on the totality of the evidence before it, the Court finds that it is has not been proved that the juvenile and the community would be better served by transferring this case to juvenile court," Holmes wrote in his decision.

Related Articles

(MORE: 'Hero' student describes how he, 2 classmates thwarted suspect in Colorado school shooting)

"The evidence before the court at this stage of the proceedings indicates that McKinney’s actions were not spontaneous, but purposeful and planned," the judge wrote. "Over many days he contemplated violent action, whether to frighten others or to cause them bodily harm."

In this May 7, 2019, file photo, parents speak with a police officer at the scene of a shooting in which at least seven students were injured at the STEM School Highlands Ranch in Highlands Ranch, Colo.
Tom Cooper/Getty Images, FILE

The judge noted that McKinney -- who was born biologically female but identifies as male -- has experienced "serious trauma" in his life, including an abusive father, drug use, depression and thoughts of suicide.

District Attorney George Brauchler said in a statement, "I am satisfied and pleased that the court agreed that this mass shooting case should be resolved in adult court."

Related Articles

(MORE: 20 years after Columbine, what's changed -- and what hasn't -- for school shootings in America)

"It is my intention to move forward without any additional delay towards the jury trial to which the defendant is entitled," Brauchler said.

Kendrick Castillo's father told The Denver Post he was "elated" with the judge’s decision.

Erickson is set to appear at an arraignment on Jan. 2.

Up Next in News—

This San Francisco shop is run completely by an AI agent

April 23, 2026

Mother charged after teen son allegedly hits and injures 81-year-old veteran while riding e-motorcycle

April 23, 2026

UK bill banning smoking products for those born after 2008 is one step away from becoming law

April 22, 2026

Pilot killed in Florida plane crash hailed as hero

April 21, 2026

Shop GMA Favorites

ABC will receive a commission for purchases made through these links.

Sponsored Content by Taboola

The latest lifestyle and entertainment news and inspiration for how to live your best life - all from Good Morning America.
  • Contests
  • Terms of Use
  • Privacy Policy
  • Do Not Sell My Info
  • Children’s Online Privacy Policy
  • Advertise with us
  • Your US State Privacy Rights
  • Interest-Based Ads
  • About Nielsen Measurement
  • Press
  • Feedback
  • Shop FAQs
  • ABC News
  • ABC
  • All Videos
  • All Topics
  • Sitemap

© 2026 ABC News
  • Privacy Policy— 
  • Your US State Privacy Rights— 
  • Children's Online Privacy Policy— 
  • Interest-Based Ads— 
  • Terms of Use— 
  • Do Not Sell My Info— 
  • Contact Us— 

© 2026 ABC News