Nearly a year after she vanished, the body of Melissa Casias, a 53-year-old administrative assistant at the Los Alamos National Laboratory, has been discovered in New Mexico. Her remains were found by a hiker in the McGaffey Ridge area of the Carson National Forest, approximately 24 kilometers from her home in Taos. A handgun was located near the remains, but authorities have not yet determined the cause of death.
Disappearance and Discovery
Casias was reported missing on June 26, 2025, after she dropped off lunch for her daughter and failed to return to work or go home. Her family grew alarmed when they discovered her personal belongings, including her purse, identification, and cell phones, had been left behind. She was last seen walking along a highway around 2:15 p.m. local time and was classified as a missing endangered person by New Mexico State Police.
Last week, a hiker stumbled upon her remains in a remote area that had been previously searched. The family confirmed the identification on a social media page dedicated to finding her, stating, "We confirm that the remains found in Rio Chiquito are Melissa." They expressed that their hearts are heavy and they intend to pursue justice.
Connection to Other Missing Scientists
Casias was the second person from the Los Alamos National Laboratory to go missing in 2025, following former employee Anthony Chavez, 78, who disappeared on May 8, 2025. These cases are part of a broader pattern of at least 10 missing or deceased scientists and lab workers linked to sensitive nuclear or space technology labs, including Los Alamos and NASA's Jet Propulsion Laboratory. Many were involved in nuclear science, space research, or studies of Unidentified Anomalous Phenomena (UAPs), and some were connected to space defense technologies being commercialized by SpaceX and Blue Origin.
The FBI has launched an investigation into possible connections after the House Oversight Committee began probing allegations that individuals tied to U.S. nuclear secrets or rocket technology have died or vanished since 2023. In an April 20 letter to FBI Director Kash Patel, Committee Chairman James Comer and Rep. Eric Burlison wrote, "Public reports raise questions about a possible sinister connection." However, authorities have not announced any link between Casias's death and the other cases.
Ongoing Investigation
The New Mexico State Police stated that the investigation remains active and ongoing. The medical examiner will conduct tests to determine the cause and manner of death. Police have not clarified how Casias died or to whom the handgun found beside her belonged. They extended their deepest condolences to the Casias and Mondragon families during this difficult time.
