An autopsy has confirmed that Melissa Casias, 54, died from a gunshot wound to the head, but medical examiners could not determine whether she fired the weapon herself or someone else pulled the trigger.
Casias, a Los Alamos National Laboratory administrative assistant, vanished from her Taos, New Mexico, home on June 26, leaving behind her phones, wallet, identification and laptop. Her daughter reported her missing that evening after discovering the abandoned belongings. Nearly a year later, on May 28, a hiker found Casias’ skeletonized remains in the McGaffey Ridge area of Carson National Forest, with a handgun lying nearby. The New Mexico Office of the Medical Investigator identified her through dental records due to the advanced state of decomposition.
The autopsy report, released this month, determined the gunshot wound caused her death but classified the manner of death as undetermined. Investigators noted that the condition of her remains limited their ability to estimate the range of fire, identify other possible injuries or detect underlying natural disease. The report also documented that some of her remains had been scavenged by animals after death, further complicating the examination.
Casias’ family has consistently pushed back against suicide theories and demanded a more thorough investigation. “The condition and circumstances in which Melissa’s remains were ultimately discovered have only raised more questions for her family,” the family wrote on the Find Melissa Mondragon Casias Facebook page. “Melissa was a mother. A daughter. A sister. A woman who was deeply loved. Her family searched for her, fought for her, and refused to give up on her while she was missing. They will not give up on her now.”
The unresolved autopsy findings have intensified interest in Casias’ case, which has become part of a broader FBI investigation examining possible connections among at least 10 federal scientists or staff members tied to highly sensitive national security-related research who have died or disappeared under unclear circumstances. Former Los Alamos employee Anthony Chavez, 79, vanished without a trace on May 4, just seven weeks before Casias. Aerospace engineer Monica Reza, 60, disappeared while hiking in a Los Angeles forest in June 2025. Government contractor Steven Garcia walked out of his Albuquerque home carrying only a handgun on August 28. Retired Air Force Maj. Gen. William Neil McCasland, 68, who had deep knowledge of UFOs and advanced aerospace research, has not been seen since leaving his Albuquerque home on February 27.
In the viral moment that first drew national attention to the pattern, observers began connecting the disappearances of multiple scientists and lab workers across 2025, fueling conspiracy theories that reached the White House and Congress. President Donald Trump addressed the speculation last month, saying “hopefully” the disappearances were just a “coincidence.” The House Oversight Committee launched its own probe into the string of cases. Some families have dismissed the more bizarre theories; McCasland’s wife, Susan McCasland Wilkerson, wrote in a Facebook post that her husband’s brief association with the UFO community “is not a reason for someone to abduct Neil” and that “no sightings of a mothership hovering above the Sandia Mountains have been reported.”
Casias’ niece, Jazmin McMillen, previously said that both of her aunt’s phones had been factory-reset before her disappearance, which the family considered an immediate red flag. Surveillance footage captured Casias walking alone on State Road 518 in Talpa wearing a backpack, and a witness described her as “staggering across the road like she was hurt or intoxicated, which she’s not a drinker.” The family noted that Casias had taken her toothbrush and thyroid medication when she left, suggesting she had intended to return.
The family’s statement upon learning of the identification emphasized their determination to continue seeking answers. “We confirm that the remains found in Rio Chiquito are Melissa,” they wrote on Facebook. “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.”
New Mexico State Police said the investigation remains active and ongoing, with the department extending “deepest condolences” to the Casias and Mondragon families. Authorities have urged anyone with information to contact the New Mexico State Police at (833) 667-7669.