The Denver Mint Heist: Colorado's Coldest Unsolved Crime
A $200,000 armored car robbery, a frozen body, and a getaway vehicle abandoned in the snow — Denver's 1922 Mint heist remains unsolved history.
A Routine Delivery, Interrupted
Denver in December 1922 was a city of streetcars, speakeasies, and a mint that, even then, held one of the largest stockpiles of currency and coin in the American West. On the morning of December 18, an armored truck from the Federal Reserve Bank pulled up outside the United States Mint building at West Colfax Avenue and Delaware Street to collect a shipment of freshly printed five-dollar bills — $200,000 worth, a staggering sum for the era, equivalent to several million dollars today.
What happened next would become the only successful armed robbery of a U.S. Mint facility in the nation’s history — and more than a century later, it remains officially unsolved.
According to accounts preserved in Denver newspaper archives and later historical summaries, four masked men ambushed the mint’s delivery truck as it idled at the curb. In the chaos of the attack, mint guard Charles T. Linton was shot and killed. The gunmen seized sacks of currency and fled in a getaway car, vanishing into the streets of Denver within minutes. Despite a massive response from local police and federal authorities, the robbers escaped clean. No one was ever arrested, charged, or convicted for the crime — a fact that still startles people when they first hear it.
The Investigation That Went Nowhere
In the immediate aftermath, Denver police and Secret Service agents pursued the case aggressively. The theft of federal currency guaranteed intense scrutiny, and the murder of a mint employee made it a capital case as well as a financial one. Newspapers like the Rocky Mountain News and the Denver Post covered the robbery extensively, feeding a public hungry for details about the brazen daylight heist.
But leads dried up quickly. The getaway car had vanished along with the gunmen, and in an era before widespread forensic science, fingerprint databases, or any kind of modern surveillance, investigators were left with little more than witness descriptions and a trail that went cold within days.
The case might have faded into obscurity like countless other unsolved robberies of the Prohibition era — if not for what happened months later.
A Body in the Snow
In late January 1923, authorities located the abandoned getaway vehicle in a residential garage in Denver. Inside, they found the frozen, decomposed body of a man believed to be Nick Trainor, a known criminal figure suspected of involvement in the mint job. Trainor had reportedly been shot, and his body had apparently been sitting in the car, undiscovered, for weeks in the bitter Colorado winter.
The discovery only deepened the mystery rather than solving it. Who had killed Trainor, and why? Was he eliminated by his own accomplices in a falling-out over the stolen money — a theory that has circulated for decades among historians and true-crime researchers? Was he killed during the robbery itself and his body stashed away by panicked partners? No definitive answer was ever established, and no other suspects were ever conclusively identified, arrested, or tried in connection with the Linton murder or the theft of mint funds.
This is where the documented history ends and the speculation begins — and it’s worth being honest about that line. What we know for certain: a guard was murdered, $200,000 vanished, and a suspected accomplice turned up dead in a car months later. Everything beyond that — theories about additional gang members, rumors of a betrayal over splitting the loot, whispers about where the rest of the money went — falls into the realm of legend that has accumulated around the case for over a hundred years.
Where Did the Money Go?
Of the $200,000 stolen, only a fraction was ever recovered. Some reports from the period indicate that a portion of the stolen bills surfaced in the weeks and months following the robbery, possibly tied to Trainor or his associates, but the bulk of the money was never found.
That unresolved detail has fueled one of Colorado’s more persistent urban legends: the idea that mint bills from the 1922 heist still occasionally surface, passed down through estate sales, found in old safes, or discovered folded into the pages of forgotten books. It’s the kind of story that thrives precisely because it can’t be disproven — a century-old robbery with a trail of cash that, theoretically, could still be out there somewhere, bearing serial numbers tied to a crime no one was ever punished for. There’s no verified modern case of recovered bills being traced back to the 1922 heist, but the legend persists in Denver’s local lore regardless, repeated at history talks and ghost-tour stops near the old mint building to this day.
Why the Case Still Haunts Denver
The Denver Mint still stands today, an active federal facility producing coins rather than currency, and still one of the most heavily secured buildings in the state. Visitors who take the public tour walk past a building with a violent, unresolved chapter embedded in its history — a guard murdered in the line of duty, a fortune in federal money that disappeared, and a case file that, as far as public record shows, was never officially closed with a conviction.
For a city that prides itself on frontier grit and Gold Rush-era legend, the mint heist occupies a strange space: it’s not folklore, not an urban legend built from nothing — it’s a real, documented federal crime with a body count and a police record, yet it carries the same unresolved tension that makes ghost stories compelling. There was a victim. There were perpetrators. And somewhere in the historical record, there’s an answer that was never written down, because no one was ever forced to confess it.
That’s what separates the Mint heist from a simple true-crime cold case and pushes it into Beyond the Rockies territory. It isn’t about hauntings or apparitions — at least, none have been seriously documented at the mint itself — but it carries the same essential mystery that drives every story we cover here: something happened, the full truth was never recovered, and the gap between what’s known and what’s rumored has been filling in with speculation for a hundred years.
Charles T. Linton’s murder remains, on paper, an open case. The identity of the three other masked men who walked away from West Colfax Avenue that December morning with sacks of federal cash has never been established. And somewhere in Colorado’s long memory, the question of where the rest of that $200,000 went remains exactly what it was in 1923: unanswered.