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House Oversight Committee Chairman James Comer has raised concerns about what he describes as a "sinister" pattern involving the deaths and disappearances of 11 U.S. scientists connected to nuclear, aerospace, and defense research. Former FBI agent Nicole Parker has examined the unusual cases, pointing to troubling details such as missing cell phones and erased digital data. In a separate case, an Iranian national was arrested for allegedly trafficking drones and weapons on behalf of Iran, drawing attention to serious national security issues affecting both the White House and NASA.
One of the 11 individuals who had mysteriously disappeared and who may have had connections to U.S. nuclear secrets or rocket technology has now been found. A hiker discovered the body in a national forest in New Mexico.
Authorities identified the remains as those of Melissa Casias, 54, an employee of Los Alamos National Laboratory (LANL). Her disappearance became part of broader speculation surrounding scientists and laboratory-affiliated personnel who had either vanished or died under unclear circumstances. These incidents attracted the attention of President Donald Trump and prompted an investigation by the House Oversight Committee.
According to a Facebook post issued late Saturday night by the New Mexico State Police Investigations Bureau (NMSPBI), a hiker found Casias' remains on Thursday in the McGaffey Ridge area of Carson National Forest. A handgun was found beside her body.
"The cause and manner of death have not yet been determined," police stated. Authorities added that the Office of the Medical Investigator (OMI) identified the remains as those of Casias and is conducting a "further anthropological examination."
Casias, who lived in Taos, New Mexico, worked at LANL alongside Anthony Chavez. Los Alamos National Laboratory is one of the nation's leading nuclear research facilities. Both Casias and Chavez were among the individuals whose disappearances were considered suspicious in FBI and House Oversight Committee investigations.
"The New Mexico State Police extend their deepest condolences to the Casias and Mondragon families during this difficult time," the agency said in its statement.
Police reported that Casias was declared missing on June 25, 2025, after she failed to arrive at work and did not return home following a visit to her daughter at work. Family members later discovered that she had left behind her purse, identification, and cell phones, raising concerns for her safety and leading to a missing persons investigation.
State police emphasized that the investigation remains active and ongoing.
In an April 20 letter addressed to FBI Director Kash Patel, the House Oversight Committee stated that it was examining "recent unconfirmed public reporting" suggesting that individuals connected to "U.S. nuclear secrets or rocket technology" had either disappeared or died in recent years.
"Public reports raise questions about a possible sinister connection between a string of mysterious deaths and disappearances which began in 2023," House Oversight Committee Chairman James Comer, R-Ky., and Rep. Eric Burlison, (R-MO) wrote in a request for information from federal agencies.
According to the committee's statement, the reported cases included two individuals connected to Los Alamos National Laboratory, two affiliated with NASA's Jet Propulsion Laboratory, an MIT scientist involved in nuclear fusion research who was shot by the Brown University mass shooter, a pharmaceutical researcher, and a government contractor employed at a facility that produces components for nuclear weapons.
Authorities have not established any connection between Casias' death and the other cases. Officials have suggested that the incidents are likely unrelated, and the House committee noted that the reports under review remain unconfirmed.
Steven Garcia, 48, an employee of the Kansas City National Security Campus, was reported missing on August 28, 2025, after leaving his Albuquerque home on foot carrying only a handgun.
Casias' disappearance had previously led New Mexico authorities to issue a Missing Endangered Advisory after she was last seen in the Taos area. She was 53 years old at the time she disappeared.
The discovery of her remains in Carson National Forest brings the search for Casias to an end. However, investigators are still working to determine how she died and to identify the owner of the handgun found beside her body.
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