A Los Alamos National Laboratory employee who vanished after erasing all records from her phones and abandoning her identification has been found dead in a New Mexico forest, raising alarming questions about what drove her mysterious disappearance nearly a year ago.
Strange Behavior Before Vanishing
New Mexico State Police identified the remains of Melissa Casias, 54, an administrative assistant at Los Alamos National Laboratory. Her body was discovered in the McGaffey Ridge area of Carson National Forest, approximately six miles from where she was last seen walking on June 26, 2025. The Office of the Medical Investigator has not yet determined the cause of death.
Casias dropped off her husband Mark, a superintendent at the nuclear lab, that June morning. She told him she needed to return home after forgetting her security badge. However, Mark later told investigators his wife had the badge with her when she dropped him off, as she would have needed it to pass through security checkpoints.
After visiting her daughter Sierra’s workplace to drop off a sandwich, Casias returned home and wiped all records from multiple phones. She then left the devices along with her identification behind and walked away from her Ranchos de Taos residence. Surveillance footage captured her walking alone shortly afterward.
National Security Concerns Emerge
Former FBI Assistant Director Chris Swecker told investigators in March that administrative assistants at classified laboratories often have access to the same sensitive files as their superiors, making them potential targets. He suggested Casias may have been abducted due to her access to top-secret government research at one of America’s most sensitive nuclear facilities.
The discovery comes as FBI Director Kash Patel has launched a major investigation into at least 11 mysterious deaths and disappearances of high-level scientists with access to classified information in nuclear, aerospace, and advanced technology programs. President Trump has publicly called the string of incidents highly suspicious and confirmed the White House is examining the cases.
Troubling Timeline Raises Questions
The location where Casias was found has been the site of a U.S. Forest Service restoration project with crews working consistently since December 2025. The fact that her remains went undetected for months in an active work area has puzzled investigators trying to piece together the timeline of events.