New details have emerged in the perplexing death of Melissa Casias, a 53-year-old administrative assistant at Los Alamos National Laboratory, whose skeletal remains were discovered nearly a year after her disappearance. An autopsy has confirmed that Casias sustained a gunshot wound to the head, though the official cause and manner of her death remain undetermined by investigators.
"There’s no way this was suicide, not from that angle. The kickback would have made the gun go straight up. That’s ridiculous. She was murdered." — Anonymous Law Enforcement Source, Daily Mail
Casias, a New Mexico resident, was last seen on June 26, 2025, before her remains were found on May 28, 2026, propped against a tree in Carson National Forest with a handgun nearby. The newly released autopsy determined that a bullet entered the lower right side of her cranial base, damaged the C1 vertebra, and exited through the left side of her head near the temple. The Office of the Medical Investigator classified the gunshot wound as "perimortem," indicating it occurred at or around the time of her death. However, due to the significant decomposition of her remains, the medical examiner could not definitively conclude whether the gunshot was the direct cause of death or whether it was self-inflicted or inflicted by another person.
The findings have intensified the mystery surrounding Casias's death, prompting further questions from her family and an anonymous law enforcement source. The source, speaking to the Daily Mail, expressed skepticism about the possibility of a self-inflicted wound given the bullet's trajectory. "There’s no way this was suicide, not from that angle," the source claimed. "The kickback would have made the gun go straight up. That’s ridiculous. She was murdered." This assessment has not been publicly adopted by the medical examiner or confirmed by New Mexico State Police, who maintain that their investigation is active.
Further complicating the case, the autopsy also revealed that Casias’s left hand and left leg were located approximately 20 feet from the rest of her remains, with investigators finding evidence suggesting wildlife scavenging after her death.
Casias's disappearance itself was marked by unusual circumstances. On the morning of June 26, 2025, she reportedly dropped off her husband, Mark Casias, at Los Alamos National Laboratory before returning to their Taos home, citing that she had forgotten her work badge. She later brought a sandwich to her daughter's workplace, informing her she would work from home due to the missing badge. Casias never reported to Los Alamos that day. Surveillance footage captured her walking alone along State Road 518, roughly three miles from her home, at approximately 2:20 p.m. Her family later reported finding a drop of blood inside their home, and both of Casias’s cellphones had been wiped and reset to factory settings.
The handling of the scene where Casias's body was recovered has also drawn scrutiny. David Adams, an attorney representing Casias’s parents and siblings, stated that relatives and volunteers returned to the area nearly a month after New Mexico State Police had cleared the scene. This group allegedly discovered additional evidence, including bones, torn and bloody clothing, a tobacco pouch, orange peels, and strands of hair that Adams said did not appear to belong to Casias. Adams emphasized that any failure to properly secure and process potential evidence could become crucial if investigators ultimately determine foul play. "There becomes a question of a chain of custody," Adams said. Casias’s relatives have consistently voiced suspicions of foul play.
Casias's employment at Los Alamos National Laboratory, a facility central to U.S. nuclear research and national security work, has fueled broader speculation. Her case has reportedly been discussed in conjunction with other deaths and disappearances involving scientists, military personnel, and individuals connected to nuclear research. The White House has reportedly directed the FBI to investigate whether there are connections among a broader series of such cases, including those involving nuclear laboratory employees, NASA scientists, and military personnel, such as retired U.S. Air Force Gen. William Neil McCasland, who previously oversaw military connections to Los Alamos research. However, no evidence cited in reports establishes a direct link between Casias’s employment at Los Alamos and her death, nor does it confirm that her case is part of any broader FBI investigation. Adams stated that he has seen no indication of specific FBI involvement in Casias’s death.
The central mystery surrounding Melissa Casias’s death remains unsolved. While the autopsy confirms a gunshot wound around the time of her death, authorities have yet to determine whether it was self-inflicted, caused by another person, or definitively responsible for her passing. New Mexico State Police continue their investigation into the complex and evolving case.
