Police say a 19-year-old with journals on 3D‑printed guns, bomb plans, and school floor maps came within “a third of the way” to a mass attack before anyone outside the home even knew his name.

Story Snapshot

• A Colorado teen admitted planning mass shootings at three schools, using 3D‑printed guns and homemade bombs.
• Deputies found a manifesto, school floor plans, hit lists, and detailed casualty goals, but no finished weapons.
• The teen took a plea deal, avoiding attempted murder convictions and receiving six years in prison.
• The case shows how cheap tech and quiet rage can turn any bedroom into a potential weapons lab, while institutions argue over labels instead of fixing deeper failures.

A Planned School Massacre Stopped Before It Started

Colorado deputies say they only learned about William “Lilly” Whitworth when a family member finally called to report violent behavior and talk of school shootings. When officers arrived at the home in late March 2023, they did not find rifles stacked in a closet or bombs ready to go. They instead found the planning stage: writings, diagrams, and instructions that, taken together, looked like a roadmap to a mass killing.

According to the arrest affidavit, Whitworth admitted being “about a third of the way from doing it” and named Timberview Middle School as the main target. Investigators say the teen had also identified Prairie Hills Elementary and Pine Creek High School, all in the Colorado Springs area, along with some churches as possible attack sites. This was not a vague fantasy. The documents pointed to specific schools, on specific maps, with specific goals.

Inside the Manifesto: 3D‑Printed Guns, Bombs, and Hit Lists

Deputies and later prosecutors describe a disturbing cache of materials: a manifesto that praised or analyzed past school shooters, listed their casualty and injury numbers, and then laid out how to beat those numbers. They say Whitworth wrote out lists of firearms, including instructions on how to use a 3D printer to fabricate them, and kept notes on how to build an improvised bomb detonator. A dry‑erase board and notebooks reportedly held hand‑drawn school floor plans, giving a clear idea of hallways, entrances, and likely choke points.

These details matter because they show intent paired with method. No completed guns or explosives were found in the home, which weakens any claim that an attack was truly “imminent.” But the teen had moved well past idle online browsing. The documents tied together targets, weapons, and desired casualty counts. In other recent cases, young people obsessed with school shootings have used 3D printers to create homemade firearms, mixing them with bomb materials and extremist writings. That pattern helps explain why authorities treated Whitworth’s plans as a serious terror threat rather than just dark fiction.

Plea Deal, Light Sentence, and Public Trust Problems

Prosecutors initially charged Whitworth with two counts of attempted first‑degree murder, plus criminal mischief, menacing, and interference with school staff and students. Those charges reflected what investigators say they saw in the home: preparations for killing children and teachers. Yet by November 2023, the case ended not with an attempted murder conviction but with a plea to second‑degree assault, a lower felony. Five other counts were dismissed as part of the deal.

In 2024, Whitworth received six years in prison and three years of mandatory parole. For some people, that sounds like mercy for someone caught early enough to be stopped and perhaps treated. For others, it looks like the system once again refusing to take threats against schools seriously. When a manifesto spells out bomb plans and casualty goals, reducing charges can feel like the government is more worried about clearing its docket than sending a strong signal that planning to murder children will draw the harshest possible response.

Identity Politics vs. Real Risks of DIY Weapon Tech

Much of the national coverage led with Whitworth’s transgender identity, linking the arrest to another recent school shooting carried out by a transgender woman in Tennessee. Headlines repeated the word “trans” before they mentioned the manifestos, floor plans, or 3D‑printed gun designs. That framing feeds a culture war that many readers on both the right and left are sick of, and it distracts from a threat that should worry everyone: cheap technology turning private anger into untraceable weapons.

Research shows extremists and self‑radicalized lone actors around the world are now using 3D printers to build guns and mix them with homemade explosives. Young people, often isolated and angry, are over‑represented in these plots. Voters of all stripes say they support basic guardrails, like software that blocks gun blueprints on consumer printers. Yet in Washington, leaders spend more time trading insults over identity and ideology than updating laws or investing in treatment and early‑warning systems. The Whitworth case spotlights a deep fear many Americans share: while our technology races ahead, the people in charge are still playing politics, and ordinary families are left to call 911 when their own kids become the threat.

Sources:

twitchy.com, 13wham.com, krdo.com, koaa.com, facebook.com, gazette.com, satellogic.com, r4.ai, cfr.org, encyclopediaofarkansas.net, nytimes.com