The Unsolved Mystery of Jaryd Atadero

On a crisp Colorado morning in October 1999, a three-year-old boy walked a few steps ahead of a hiking group and was never seen alive again. Nearly four years later, hikers stumbled onto the remains of his clothing high above the trail where he vanished — and what they found only deepened one of the strangest unsolved cases in American wilderness history. More than two decades on, no one has ever officially determined how Jaryd Atadero died.

A Happy Kid on an Ordinary Hike

Jaryd Atadero lived with his father, Allyn Atadero, and his six-year-old sister, Josallyn, at the Poudre River Resort, a small lodge Allyn co-owned with his twin brother about 60 miles west of Fort Collins, Colorado. Allyn, a physical education teacher and single father raising two kids, had recently gotten involved with a local group called the Christian Singles Network, which had become a source of community and support in his day-to-day life.

On the morning of October 2, 1999, members of that group planned an outing to a nearby fish hatchery — a short, easy trip that Allyn agreed his children could join. What the group actually did was hike the Big South Trail instead, a rugged path through the Comanche Peak Wilderness in the Arapaho and Roosevelt National Forest, roughly 15 miles from the resort. Allyn wasn’t with them; he had stayed behind, believing his kids were headed somewhere much less remote.

Jaryd, described by his father as a happy-go-lucky kid with an infectious smile, had insisted on tagging along after his sister was given permission to go. He wore sneakers he refused to have tied and a beige jacket. At some point during the hike, Jaryd ran ahead of the group — no more than 100 feet or so — and briefly spoke with some fishermen along the trail. He then continued on ahead, out of sight of the adults responsible for watching him.

That was the last confirmed sighting of Jaryd Atadero.

A Massive Search Turns Up Nothing

When the group realized Jaryd was missing, the search that followed became, in Allyn’s own words, like a hurricane — the largest search operation Larimer County had seen up to that point. Ground teams, search dogs, dive teams checking pools along the narrow river, and aircraft combed the canyon for days. The effort was further complicated when a helicopter assisting with the search crashed on October 3, injuring five people aboard, though no one was killed.

Despite the scale of the operation, searchers found no trace of the boy — no clothing, no footprints beyond the initial area, nothing. As days turned into weeks and the search was gradually scaled back, Jaryd Atadero’s disappearance went cold, with investigators unable to determine whether he had wandered off the trail, fallen into the river, been taken by an animal, or been harmed by another person.

Clothing Found Nearly Four Years Later

The case remained unsolved until June 2003, when two Fort Collins businessmen, Gary Watts and Rob Osborne, were hiking off-trail in the same wilderness area. Roughly 500 feet above the Big South Trail, on a steep talus slope more than a mile up the canyon from where Jaryd had disappeared, they came across scattered, torn clothing: a brown fleece pullover with what appeared to be puncture holes, blue sweatpants that were badly shredded and missing one leg, and a small pair of white Disney’s Tarzan sneakers — the same character Jaryd had loved and worn the day he vanished.

The hikers photographed the site and reported it to the Larimer County Sheriff’s Office. Investigators returned to the location and, over the following days, recovered a skull fragment and a tooth from the same steep slope. DNA testing conducted at the time indicated an 86 percent likelihood that the remains belonged to Jaryd; more advanced DNA analysis conducted years later would confirm the match at 100 percent.

For Allyn Atadero, the discovery ended nearly four years of holding onto hope that his son might still be found alive. He would later describe realizing, once officials confirmed the cranium and tooth were Jaryd’s, that his son had died somewhere on that mountain.

A Death That Was Never Officially Explained

What makes Jaryd Atadero’s case so unusual isn’t just that it took nearly four years to find any trace of him — it’s that even after his remains were found, investigators were never able to determine exactly what happened to him. His eventual death certificate listed the cause as undetermined, with a probable mountain lion attack noted as the most likely explanation.

But that explanation has never sat comfortably with everyone involved in or familiar with the case. Investigators noted that the Colorado Bureau of Investigation found no blood at the site and no clearly identifiable predator hair, only two unidentified hairs recovered along with the clothing. Experts on big cats have pointed out that the pattern of the remains didn’t fit typical mountain lion behavior — a mountain lion would ordinarily consume or cache a kill near ground level rather than leave scattered clothing high up a steep, difficult-to-reach slope. The sneakers, notably, showed little sign of weathering despite having been exposed to the elements for roughly four years, while the sweatpants were found turned inside out.

Those inconsistencies have fueled decades of speculation — from theories that a person, rather than an animal, may have carried Jaryd up the slope, to the case’s inclusion in researcher David Paulides’s “Missing 411” project, which catalogs unexplained disappearances in wilderness areas across North America, some connected to speculative and unproven theories involving unknown outside forces. None of those theories have ever been substantiated by evidence, and the Larimer County Sheriff’s Office investigated everyone connected to the hike — including the members of the Christian Singles Network and the fishermen Jaryd briefly spoke with — without finding any indication of foul play. As of today, the case remains formally unsolved, and no one has ever been named a suspect.

A Father’s Grief Became a Legacy

Rather than let his son’s death fade into a cold case file, Allyn Atadero spent the rest of his life turning his grief into advocacy. He successfully pushed for Colorado to adopt the AMBER Alert system, and in 2002 stood alongside then-Governor Bill Owens as the bill was signed into law — fittingly, on Allyn’s own birthday. In 2008, Governor Bill Ritter declared September 8 as Recreational Safety Awareness Week in Jaryd’s honor, promoting simple safety tools like whistles and brightly colored clothing for children in the outdoors. The stretch of the Big South Trail where Jaryd vanished was later dedicated in his memory.

Allyn also wrote about his son’s disappearance and his own faith-driven path through grief in a memoir, later followed by a second book examining the case further. In an unusual and deeply personal choice, he opted not to bury or cremate the recovered skull fragment, instead keeping it inside a shrine built in Jaryd’s old bedroom — left exactly as it had been before his son disappeared, surrounded by Jaryd’s favorite toys.

Allyn Atadero died in April 2025 at the age of 67, having spent more than two decades without ever learning the full truth of what happened to his son on that mountain trail. He often said the pain of Jaryd’s death never faded — describing it, even decades later, as feeling like it had happened yesterday.

A Mystery That Remains Unsolved

More than 25 years after Jaryd Atadero disappeared just steps ahead of a group of adults on a well-traveled Colorado trail, his case remains one of the most puzzling unresolved child disappearances in the country. Was he taken by a mountain lion, as his death certificate suggests, despite the physical evidence that doesn’t quite fit? Did a person — a stranger, or someone in the hiking group itself — cause his death and leave his belongings on that remote slope? Or is there still some explanation no one has considered?

For now, those questions remain exactly that: questions. Jaryd’s sister, Josallyn, now an adult, has spoken about finding a measure of peace through faith, even without answers. And law enforcement in Larimer County has said Jaryd’s case is one they have never truly let go of, even a quarter-century later.

Somewhere on that Colorado mountainside, the full story of what happened to a three-year-old boy is still waiting to be found.