Los Alamos federal lab worker went missing after taking lunch to her daughter. now a hiker may have provided some closure
The remains of Melissa Casias were found by a hiker in Carson National Forest, almost a year after her disappearance following a lunch visit with her daughter. This discovery, which occurred on May 28, has finally provided a measure of closure for a case since her disappearance in the summer of 2025.
As reported by The Hill, the New Mexico State Police confirmed that the remains were found in the McGaffey Ridge area, positioned next to a handgun. While the Office of the Medical Investigator successfully identified the remains as those of Casias, officials have not yet determined a specific cause of death. The investigation remains active and ongoing as authorities piece together the final moments of her life.
Casias, who served as an administrative assistant for the federal government at the Los Alamos National Laboratory, first went missing on Thursday, June 26, 2025. According to KRQE News, her day began normally, as she initially drove toward her workplace at the lab. However, upon realizing she had forgotten her security badge, which is essential for entry, she opted to return home to work remotely
Casias reportedly got up and walked out of the house by herself
During the early afternoon, she headed out to bring lunch to her daughter at the John Dunn Shops in the Taos Plaza. Her niece, Jazmin McMillen, noted that surveillance footage captured Casias leaving the area just before 1:00 PM. This was the last time she was seen by those who knew her before she vanished into thin air. When her daughter eventually returned home later that day, she found a deeply concerning scene.
According to McMillen, Casias had left behind all of her essential personal items. Her purse, car, keys, wallet, work phone, personal phone, and computer were all left at the residence. The disappearance triggered a massive, multi-agency search effort that included law enforcement, volunteers, and family members.
In the immediate aftermath of her disappearance, the search expanded to cover a vast amount of terrain. The family worked diligently to organize search parties, creating large maps of the area and dividing the landscape into sixteen distinct grid areas to ensure no stone was left unturned. Despite these efforts, which spanned hundreds of hours, the initial searches did not lead them to her.
A critical piece of information emerged when a tipster reported seeing Casias walking alone along Highway 518 in Talpa. This sighting was corroborated by Ring doorbell camera footage, which the family confirmed showed her wearing the same clothing she had on earlier that day. This remained the final confirmed point of contact for months, leaving the family in a state of uncertainty as they continued to advocate for her safe return.
Human remains found by a hiker last week in a New Mexico national forest are those of a Los Alamos National Laboratory employee who had been missing for nearly a year, authorities say. https://t.co/706q8wReXQ
— NBC News (@NBCNews) June 2, 2026
The family maintained a dedicated Facebook page throughout the search, which they eventually used to share the difficult news of the discovery. “We confirm that the remains found in Rio Chiquito are Melissa,” the family stated in a post. “There will be more information to come but what we can tell you now is she was located in an area previously searched. This is a lot to process, our hearts are heavy and we fully intend to continue to pursue answers for justice.”
Throughout the ordeal, the family worked tirelessly to keep the case in the public eye. They offered a $5,000 reward for information and utilized platforms like GoFundMe to support their search operations. McMillen frequently spoke to the media to ensure the public did not forget about her aunt. “No positive news right now,” she said during the early days of the search. “We’re really just trying to kind of keep it top of mind for people in the area.”
🚨 It was one of a number of deaths of U.S. scientists which attracted public attention earlier this year. https://t.co/1ku0SXn5pi
— Newsweek (@Newsweek) June 1, 2026
Now that the remains have been found, the focus shifts entirely to the ongoing investigation by the New Mexico State Police, so that everyone can understand what happened. Cassias is one of the 11 scientists and administrators who went missing or died last year. In fact, most of the missing cases have similar circumstances, like leaving their personal effects at home. These similarities and other details have been odd enough that the House Oversight Committee and the FBI have launched separate investigations into the matter, though it’s unclear whether they are directly linked.
