Nearly a year after Melissa Casias went missing, a hiker discovered her remains in New Mexico's Carson National Forest(Photo: New Mexico State Police)
August 14, 2026, Update:According to an autopsy report obtained byOutside, Casias died by a “gunshot wound of head.” The manner of her death is listed as undetermined.
“Given the state of the body… and paucity of information available at the time of the writing of this report regarding the circumstances of her death, the manner of death is certified as undetermined,” the report read.
In a statement to New Mexico news outletKOAT, the Casias family wrote: “The ruling of ‘undetermined’ does not mean that anyone has been found responsible for my mother’s death, nor should it be used as an opportunity to create a narrative that the evidence does not establish.”
New Mexico’s Carson National Forest is a vast, timbered maze of remote dirt roads and jeep trails. The McGaffey Ridge section of the forest, 15 miles north of the small Northern New Mexican town of Peñasco, is described by those who live in the region as a locals-only kind of place; the area’s steep canyons and rocky slopes are dotted with open stands of Ponderosa Pines and Douglas Fir, largely inaccessible by foot.
It was here on May 28, 2026, that a hiker alongMcGaffey Ridge, an elevation of 8,600 feet, discovered the remains of Melissa Casias, 54, a scientist who vanished without a trace one year earlier, alongside a handgun, according to theNew Mexico State Police. Authorities are investigating the cause and manner of her death, but her body was found near an area that both canine and search-and-rescue teams had previously spent days searching.
Delinda VanneBrightyn is the president and K9 unit leader forSearch and Rescue (SAR) Taos, the agency that initially searched for Casias. She has worked with the team for 24 years, and toldOutsidethat this was one of the toughest searches she’s participated in.
“It was one of the more difficult searches that I have been on, and I have been on hundreds,” VanneBrightyn toldOutside. “We were walking in almost upper-thigh deep mud with every step. It was a very grueling search. When you’re going through that, you’re moving just one foot at a time.”
Now, nearly a year later, the Casias case perhaps offers more questions than answers.
A Year-Long Missing Persons Case
Casias, 53, was an administrative assistant at Los Alamos National Laboratory (LANL), a 40-square-mile research facility in New Mexico established in 1943 to develop the first atomic weapons. She wasreported missingfrom her home in Taos, New Mexico, on June 26, 2025, when she didn’t arrive at work or return home from visiting her daughter, police said.
“Family later discovered that her personal belongings, including her purse, identification, and cell phones, had been left behind, prompting concern for her welfare and a missing person investigation,” wrote NMSP in astatement.
Surveillance footage showed her last steps along a highway in Talpa, New Mexico, five miles from her home in Taos, wearing a backpack and a turquoise shirt. She had just dropped off lunch for her daughter.
Her body was discovered roughly 15 miles from her home. Her work and personal phones were left behind, reset to factory settings.
The Discovery on McGaffey Ridge
Responders began their search for Cassias at what’s known as the point last seen, the location where a missing person was last seen by a verifiable source. According to VanneBrightyn, the team searched southbound from Highway 518, a road that connects the Talps neighborhood of Taos to the nearby canyons and mountains.
For three days, members ofSAR Taos,Sandia Search Dogs, the New Mexico State Police, and the local sheriff’s office searched for Casias along the highway. They waded through dense willow growths, deep beaver ponds, and thigh-high mud that made their efforts slow and strenuous.
“It’s so unforgivable and so intense. My dog was exhausted at the end. I don’t think I’ve ever seen him quite that tired from a mission—it was just such different circumstances,” VanneBrightyn said. On the third and final day of the search, VanneBrightyn said more than a dozen people were on the ground, along with three dogs and at least one drone.
By VanneBrightyn’s calculations, Casias was found high on a ridgeline roughly 1.5 miles from the low-valley area responders searched. The area is separated by a steep climb, and reaching the summit would have required technical ropes teams—but there was no evidence to suggest she was up there.
“We had nothing to point to the fact that she would be up on that ridge,” VanneBrightyn said.
Without formal conclusions for investigators, it’s impossible to speculate how or why Casias made it to the ridge. However, VanneBrightyn said that the area where her remains were found is accessible by a remote road through a nearby valley. Long trails also weave their way through the mountains here, taking hikers from the valley, through hot springs, and up into the mountains.
“We’re unsure of the circumstances of her death, whether she was hiking solo or what was happening. No one should jump to any conclusions. We will have to wait for the investigation,” VanneBrightyn said.
An Ongoing Investigation
Casias is among a group of at least ten other missing or deceased scientists and lab staff who worked at sensitive nuclear and space technology labs that have gone missing in the last year, prompting a slew of conspiratorial speculations. The FBI is leading an investigation into possible connections between the cases,CBS Newsreported.
“This is a lot to process, our hearts are heavy, and we fully intend to continue to pursue answers for justice,” Casias’ family wrote in astatementon a page dedicated to her case.
Outsidecontacted the FBI and the New Mexico State Police for comment on the investigation, but did not receive a response in time for publication. We will update the story if one is received.
