The White House has said the U.S. government will review concerns surrounding a series of deaths and disappearances involving high-profile scientists linked to sensitive space and nuclear research.
Reports indicate that since 2023, at least ten individuals connected to top-level scientific and defence-related projects have either died under unclear circumstances or gone missing, raising public concern.
Addressing the issue for the first time on April 15, White House Press Secretary Karoline Leavitt said the administration had not yet been fully briefed but would look into the matter.
“I haven’t spoken to our relevant agencies about it. I will certainly do that and will get you an answer,” she said, adding that if confirmed, the situation would warrant attention from the government.
Her response, however, drew further questions from reporters, with some expressing concern that no formal investigation appeared to be underway despite the number of cases.
Among the most notable incidents is the disappearance of retired U.S. Air Force General William Neil McCasland, who reportedly went missing in February after overseeing classified programmes at Wright-Patterson Air Force Base, a key hub for advanced space and defence research.
Other cases involve individuals linked to NASA Jet Propulsion Laboratory. These include research scientist Michael David Hicks, who died in July 2023 without a publicly confirmed cause, and Frank Maiwald, who passed away in July 2024 under similarly unclear circumstances.
Astrophysicist Carl Grillmair, also associated with NASA’s Jet Propulsion Laboratory, was reportedly killed during what authorities described as a suspected burglary incident in California.
In another case, Steven Garcia, a contractor with high-level security clearance at U.S. nuclear facilities, was reported missing in August 2025 after being last seen leaving his home. While authorities suggested he may have posed a risk to himself, associates have disputed that claim.
Two individuals connected to Los Alamos National Laboratory—Anthony Chavez and Melissa Casias—also disappeared weeks apart in 2025 after leaving their homes in New Mexico.
Additionally, Nuno Loureiro, a professor at Massachusetts Institute of Technology working on nuclear fusion, was killed at his residence in Boston, while pharmaceutical researcher Jason Thomas was found dead in a Massachusetts lake after being reported missing.
Another case involves Monica Jacinto Reza, who disappeared during a hiking trip shortly after assuming a leadership role at NASA’s Jet Propulsion Laboratory.
While authorities have treated many of these incidents as unrelated, the pattern has drawn increased scrutiny, particularly given the individuals’ connections to sensitive scientific and national security work.
As of now, U.S. officials have not confirmed any link between the cases, but the White House says it will seek further clarification from relevant agencies.