Denver suburb looks for answers after school shooting
From Tragedy to "STEM Strong": The Highlands Ranch School Shooting Seven Years Later (2019‑2026)
On May 7, 2019, the prosperous Denver suburb of Highlands Ranch joined a list no community ever wants to be on. Two students walked into the STEM School Highlands Ranch—a public charter school serving 1,850 students from kindergarten through 12th grade—and opened fire with handguns. By the time the chaos subsided, 18‑year‑old Kendrick Castillo lay dead, having lunged at one of the shooters in an act of selfless heroism that saved countless lives. Eight other students were injured, some critically. The shooting occurred just seven miles from Columbine High School and less than a month after the 20th anniversary of that massacre, compounding the trauma for a region already scarred by school violence. The original article on this site captured the community's desperate search for answers in the immediate aftermath, with Douglas County Sheriff Tony Spurlock confirming the arrests of 18‑year‑old Devon Erickson and a juvenile accomplice, later identified as Alec McKinney.[reference:0]
Seven years later, the answers have come—in courtrooms, in legislative chambers, in memorial parks, and in the quiet, daily work of healing. Erickson is serving life without parole. McKinney faces at least 40 years before any chance of freedom. The State of Colorado has poured millions into school safety and passed new laws to prevent the next tragedy. Kendrick Castillo's name is now etched into the community's physical landscape, and an effort to canonize him as a saint is underway. And the students who survived—like Ellie Wyse, who was a freshman that day—have turned their trauma into purpose. This is the story of what happened after the cameras left Highlands Ranch.
📋 The 2019 Starting Point: A Community in Shock
The original 2019 article on this site captured the raw, disorienting aftermath. "A Denver suburb looked for answers on Wednesday concerning why two understudies strolled into their school and opened discharge with handguns, harming eight individuals and killing one only a couple of miles from where a school slaughter occurred 20 years back."[reference:1] Sheriff Spurlock identified Devon Erickson, 18, as one of the shooters and said both suspects were captured within minutes. One student, 18‑year‑old Kendrick Castillo, was pronounced dead at the scene. Eight others were injured, with two remaining in serious condition.[reference:2]
The details that emerged painted a chilling picture. One shooter allegedly carried his weapon into the school concealed in a guitar case before opening fire in a darkened classroom where students were watching a movie. A witness named Fernando Montoya recounted how his 17‑year‑old son was shot multiple times. "He said a person hauled a gun out of a guitar case and began to shoot," Montoya told Denver 7.[reference:3]
The early reporting also hinted at the complex motives that would later be examined in court. Colorado ABC affiliate Denver 7, citing law enforcement sources, reported that "a mix of variables, including retribution and outrage, prodded the assault." One suspect allegedly faced bullying for transitioning from female to male and identifying as male.[reference:4]
💡 Expert Perspective: The Columbine Shadow
The STEM shooting's proximity to Columbine—both geographically and temporally—created a uniquely traumatic context for the community. For parents who had lived through the 1999 massacre, this was a nightmare revisited. For students, it was a brutal reminder that the promises of "never again" had not been kept. Research on communities that experience multiple mass casualty events shows elevated rates of complex trauma, hypervigilance, and a profound erosion of the sense of safety that schools are supposed to provide. Highlands Ranch would have to navigate not just the fresh wound of STEM, but the reopened scar of Columbine.
⚖️ The Shooters: Justice Served
The legal proceedings against Devon Erickson and Alec McKinney unfolded over two years, culminating in sentences that reflect the gravity of their crimes and the distinct legal treatment of juvenile versus adult offenders.
Devon Erickson: Life Without Parole
Devon Erickson, 18 at the time of the shooting, was tried as an adult. In June 2021, he was convicted of first‑degree murder, attempted first‑degree murder, conspiracy to commit first‑degree murder, and dozens of other charges. On September 17, 2021, Douglas County District Court Judge Theresa Slade sentenced Erickson to life in prison without the possibility of parole, plus an additional 1,282.5 years. The judge told Erickson he had shown "no remorse" and had "failed to help a devastated community understand his actions."[reference:5][reference:6]
During the sentencing hearing, survivors and family members delivered emotional testimony. John Castillo, Kendrick's father, spoke directly to Erickson: "You're a coward. You're a monster." The Castillo family and others affected by the shooting have expressed that while no sentence can bring Kendrick back, the finality of life without parole provides a measure of justice. Erickson has not mounted any successful appeals and remains incarcerated in the Colorado Department of Corrections.
Alec McKinney: A Juvenile's Life Sentence
Alec McKinney, who was 16 at the time of the shooting and identified as transgender, pleaded guilty in February 2020 to first‑degree murder and other charges. In July 2020, McKinney was sentenced to life in prison with the possibility of parole, plus an additional 38 years. Because McKinney was a juvenile at the time of the crime, Colorado law—specifically a 2016 statute governing juvenile offenders—makes him eligible for parole consideration after serving 40 years. McKinney testified against Erickson at his trial, providing critical evidence about the planning and execution of the attack.[reference:7][reference:8][reference:9]
The sentencing of McKinney highlighted the ongoing legal and moral debate over how to handle juvenile offenders convicted of the most serious crimes. While some victims' families expressed frustration that McKinney might one day walk free, the law reflects a growing recognition—bolstered by Supreme Court rulings and neuroscience research—that adolescent brains are not fully developed, and that juvenile offenders have a greater capacity for rehabilitation than adults.
🏅 Kendrick Castillo: A Hero's Legacy
If there is a single image that endures from the STEM shooting, it is not one of the gunmen, but of Kendrick Castillo—an 18‑year‑old senior who, in his final moments, lunged at an armed shooter to protect his classmates. Castillo was a robotics enthusiast, a lover of fishing and hunting, and by all accounts a kind and gentle soul. His father, John Castillo, later said simply: "He threw himself at an armed student so his classmates could live."[reference:10]
In the seven years since his death, Castillo's legacy has been honored in increasingly profound ways. In November 2025, six years after the shooting, a permanent memorial was unveiled at Highlands Ranch's Civic Green Park. The Douglas County Community Foundation, working alongside John and Maria Castillo, created a physical space where the community can remember Kendrick's sacrifice. The memorial features a bronze statue and plaques that tell his story.[reference:11]
Perhaps the most remarkable development is the effort to have Kendrick Castillo canonized as a saint in the Catholic Church. In August 2025, Colorado priests and local Catholic leaders announced they were pursuing the cause for Castillo's canonization, citing his ultimate sacrifice for others. "Just as Christ laid down His life for us, an eighteen‑year‑old boy named Kendrick Castillo laid down his own life to save his fellow students," one advocate wrote. The process is in its early stages, but it speaks to the profound impact Castillo's heroism has had on the community and beyond.[reference:12][reference:13]
Castillo's name also lives on in the physical landscape of Highlands Ranch. A roadway near the school has been renamed "Kendrick Castillo Way"—a constant, daily reminder of his sacrifice.[reference:14]
📜 Policy and Legislative Changes: Colorado Responds
In the wake of the STEM shooting, Colorado lawmakers at both the county and state levels took action to address school safety and gun violence prevention.
Douglas County's $10 Million Investment
Within days of the shooting, the Douglas County Board of Commissioners committed $10 million in additional funding for school safety and mental health across the county's public schools. More than $6 million was allocated directly to public schools, with the remaining funds supporting county‑wide initiatives.[reference:16][reference:17]
As of 2022, the Douglas County School District had spent nearly two‑thirds of its allocated funds. Investments included approximately $1.7 million on improved radio communications between police and the school district—ensuring there is "not one spot in the school where they don't get good radio coverage"—and nearly $500,000 on exterior door alarms at high schools. Another $1.36 million was spent on ballistic windows with bulletproof film, along with funding for door locks, defense training, and emergency trauma kits.[reference:18]
Statewide Gun Violence Prevention Laws
At the state level, Colorado lawmakers have continued to strengthen gun violence prevention measures. In April 2026, Governor Jared Polis signed SB26‑004, which expands Colorado's existing "Red Flag" law—formally known as the Extreme Risk Protection Order (ERPO) law—to allow institutional petitioners such as health care facilities, behavioral health treatment facilities, K‑12 schools, and higher education institutions to petition for the temporary removal of firearms from individuals deemed a danger to themselves or others.[reference:19]
"Colorado Democrats created our Red Flag law in 2019 to keep guns out of the hands of dangerous individuals. We're strengthening this gun violence prevention law to save more lives and make Colorado a safer place to live for all," said Representative Meg Froelich.[reference:20]
Additionally, HB25‑1250, which became law in June 2025, requires the Colorado Department of Public Health and Environment to post gun violence prevention materials online and mandates that school districts distribute these materials to parents at the beginning of each school year, starting in January 2026.[reference:21]
The Evergreen Community Safety Act
In February 2026, following another school shooting in Evergreen, Colorado, Representative Brittany Pettersen unveiled the Evergreen Community Safety Act at the federal level. The legislation would require social media and telecommunications companies to respond to FBI subpoenas and warrants related to credible threats within 72 hours—rather than the 35 days currently permitted. "Faster responses would give law enforcement the time they need to intervene and potentially save lives before violence occurs," Pettersen stated.[reference:22]
💚 Community Healing and Long‑Term Impact: "STEM Strong"
Beyond the courtrooms and legislative chambers, the most important work has been the slow, painstaking process of healing. The students and staff of STEM School Highlands Ranch have carried the weight of May 7, 2019, into every subsequent year of their lives.
Five years after the shooting, in May 2024, counselors at the school reflected on the "STEM Strong" message that emerged in the immediate aftermath. High school counselor Colene Belisle described her focus as helping students "turn trauma into resilience." She emphasized that "negative experiences don't define us, it's how we respond that recreates resiliency within."[reference:23] Middle school counselor Lisa Clay uses an evidence‑based social‑emotional curriculum that starts as early as kindergarten.[reference:24]
Nicholas Kruus, who was a middle schooler at the time of the shooting, shared his journey: "Most of my memories are just kind of being crouched in the corner, and very scared." He moved to Canada for his early high school years but returned to STEM when his family came back to Colorado. He credits the supportive environment and high academic standards for helping him move past the trauma. "I ended up realizing that in my life, I really want to try and be a good person and I really want to try and make a positive change," Kruus said.[reference:25]
Ellie Wyse, a freshman at the time of the shooting, has channeled her experience into a career path. Now a psychology major in her senior year at Ohio's Cedarville University, Wyse plans to become a trauma therapist. "The shooting had a pretty big impact on me," she said. "I went through my own share of trauma. I want to help people in the same way I was helped." Wyse was in Castillo's class that semester and had eaten lunch with McKinney, who she said talked about the shooting beforehand. "It's really hard to know whether a teenager is being serious about that kind of thing or not," she reflected, emphasizing the importance of reporting mental health struggles.[reference:26]
Wyse's recovery was complicated by the COVID‑19 pandemic, which struck less than a year after the shooting. "Coming out of the shooting and into sophomore year I was pretty OK. I had that community support I really needed… then the whole world locked down, and all that support was suddenly ripped away from me." She said the lockdown led to further feelings of isolation, but she ultimately found purpose in her pursuit of a career in therapy. "You can keep going and you can keep growing and becoming who you want to be, and the pursuit of that is so helpful in your whole recovery process."[reference:27]
💡 Expert Perspective: The Long Arc of Recovery
The experiences of students like Nicholas Kruus and Ellie Wyse illustrate a critical truth about trauma recovery: it is not linear, and it does not have a fixed endpoint. Survivors of school shootings often experience waves of symptoms—anniversaries, media coverage of other shootings, and life transitions can all trigger renewed distress. But as Wyse's journey shows, post‑traumatic growth is possible. Many survivors find meaning in advocacy, in helping others, or simply in the quiet determination to live fully despite what they have endured. The "STEM Strong" message is not just a slogan; it is a daily practice of resilience.
📊 STEM School Highlands Ranch Shooting: 2019 vs. 2026
| Aspect | 2019 (Immediate Aftermath) | 2026 (Current Reality) |
|---|---|---|
| Fatalities & Injuries | 1 killed (Kendrick Castillo); 8 injured | Castillo honored with memorial, street renaming, canonization effort |
| Devon Erickson | Arrested, awaiting trial | Life without parole + 1,282.5 years; no successful appeals |
| Alec McKinney | Arrested as juvenile; motive linked to bullying over gender transition | Life with parole eligibility after 40 years; testified against Erickson |
| School Safety Funding | Douglas County commits $10 million | Nearly two‑thirds spent on radios, door alarms, ballistic windows, trauma kits |
| State Legislation | Red Flag law created in 2019 | SB26‑004 expands ERPO petitioners to include schools and health facilities (2026) |
| Parent Education | No formal requirement | HB25‑1250 requires schools to distribute gun violence prevention materials (2026) |
| Community Healing | Vigils, "STEM Strong" message emerges | Ongoing counseling; survivors pursuing careers in mental health |
| Kendrick Castillo's Legacy | Hailed as a hero; memorials begin | Permanent memorial (2025); canonization effort underway; street renamed |
📋 The Bottom Line: Key Takeaways for 2026
⚖️ Justice Was Served, but Differently: Devon Erickson will die in prison; Alec McKinney has a theoretical chance at parole after 40 years. The sentences reflect the legal distinction between adult and juvenile offenders, a distinction that remains controversial.
🏅 Kendrick Castillo's Heroism Endures: From a permanent memorial at Civic Green Park to a street bearing his name to an active canonization effort, Castillo's sacrifice has been woven into the fabric of Highlands Ranch. He is remembered not as a victim, but as a hero.
💰 Tangible Safety Investments Were Made: Douglas County's $10 million commitment funded improved radio communications, ballistic windows, door alarms, and trauma kits. These are concrete, physical changes designed to prevent or mitigate future attacks.
📜 Colorado's Laws Have Strengthened: The expansion of the Red Flag law in 2026 to allow schools and health facilities to petition for ERPOs represents a meaningful policy shift. The new requirement for schools to distribute gun violence prevention materials to parents is another step.
💚 Healing Is Ongoing and Non‑Linear: Survivors like Nicholas Kruus and Ellie Wyse have turned their trauma into purpose, pursuing education and careers in helping professions. But anniversaries and life transitions continue to present challenges.
🦠 The Pandemic Compounded Trauma: For many STEM survivors, the isolation of COVID‑19 lockdowns—coming less than a year after the shooting—ripped away the community support that was essential to their recovery.
🔮 The Work Continues: No law, no memorial, and no amount of time can undo what happened on May 7, 2019. But the community of Highlands Ranch has demonstrated that even in the face of unimaginable loss, it is possible to build resilience, honor heroes, and keep moving forward.
🔔 Enjoy evidence‑based school safety and community resilience analysis? Subscribe for free weekly updates — no spam, just insight.