Melissa Casias, 53, an administrative assistant at Los Alamos National Laboratory, went missing in late June 2025 and was found dead in New Mexico nearly a year later, authorities said [1, 2]. Her remains were discovered by a hiker on May 28, 2026, in the McGaffey Ridge area of Carson National Forest [1, 2, 3]. A handgun was found near the remains, although the cause and manner of death have not been determined and investigations remain ongoing [1, 2, 3].
Casias was last seen on June 26, 2025, when she reportedly dropped off her husband at work at LANL and then unexpectedly returned to their home in Ranchos de Taos because she had forgotten her badge [2]. Her disappearance raised concern after personal items including her purse, identification, and cell phones were found left behind [1, 3]. Some sources report her as missing as of June 25, 2025, after failing to arrive at work or return home following a visit with her daughter [1, 3].
Her identity was confirmed in coordination with the New Mexico Office of the Medical Investigator [1, 2, 3]. Her family said, "This is a lot to process, our hearts are heavy and we fully intend to continue to pursue answers for justice" [1]. Her husband Mark Casias said, "That was pretty much the last I spoke to her that day" [2].
Casias’s death is part of a larger series of mysterious disappearances and deaths linked to U.S. nuclear, space, and defense research fields. These cases have drawn attention from the FBI, Congressional investigators, and former President Donald Trump [1, 2, 3]. House Oversight Committee Chairman James Comer and Rep. Eric Burlison said, "Public reports raise questions about a possible sinister connection between a string of mysterious deaths and disappearances which began in 2023" [3].
Authorities continue investigations into Casias’s death. The case adds to ongoing concerns over safety and security involving personnel tied to sensitive U.S. research programs.
