FBI probes deaths, disappearances of 10 US scientists in 4 years

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The FBI has launched a comprehensive investigation to determine if the deaths and disappearances of at least 10 high-profile U.S. scientists and government officials over the past four years are linked. The federal inquiry comes amid intense pressure from the White House and Capitol Hill, as online speculation regarding the pattern of these incidents continues to grow.

The individuals in question held positions at some of the nation’s most sensitive institutions, including NASA’s Jet Propulsion Laboratory, Los Alamos National Laboratory, and MIT’s Plasma Science and Fusion Center. Others were involved in critical private-sector cancer research or held high-ranking roles within the U.S. Air Force. The geographic scope of the cases is broad, spanning California, New Mexico, Massachusetts, and New Hampshire.

Several specific cases have drawn significant scrutiny. One prominent example is the ongoing search for retired Air Force Maj. Gen. William Neil McCasland, who vanished from his New Mexico home in February 2026. While some online theorists have pointed to his past involvement in UFO-related media projects, his family has firmly denied he possessed any classified information that would make him a target. In another instance, the 2025 disappearance of NASA JPL scientist Monica Jacinto Reza remains a mystery; she vanished during a hike in the Angeles National Forest, leaving no physical evidence behind.

Other cases, however, appear to be tied to clear personal motives. The December 2025 murder of MIT physicist Nuno F.G. Loureiro by a former classmate, Cláudio Manuel Neves Valente, followed a deadly shooting spree by the same assailant at Brown University. Similarly, the 2026 murder of Caltech astrophysicist Carl Grillmair is linked to a suspect who had previously been flagged for trespassing on his property.

The federal response is multi-agency, involving the Department of Energy and the Department of Defense. On April 20, the House Oversight Committee formalized its own investigation, demanding briefings from federal agencies by April 27. House Oversight Chairman James Comer has publicly stated his skepticism that these events are merely coincidental, labeling the trend a potential national security threat.

Despite the political urgency, many law enforcement professionals and former officials remain unconvinced of a grand conspiracy. Critics of the federal review process argue that linking these disparate cases is premature and ignores the specific, individual circumstances—such as personal mental health struggles or unrelated criminal motives—that define many of the cases. Skeptics suggest that in a country with thousands of high-level researchers, the statistical likelihood of deaths and personal tragedies is high, and that the "pattern" may be a product of intense public and political attention rather than a coordinated effort to target American scientific talent.