WASHINGTON — Federal authorities are investigating a string of deaths and disappearances involving at least 11 American scientists and researchers with ties to sensitive nuclear, aerospace and space defense programs, as lawmakers warn the pattern could signal a national security threat and fuel speculation of coordinated foul play.

The cases, spanning from 2022 to early 2026, include scientists from NASA's Jet Propulsion Laboratory, Los Alamos National Laboratory and other facilities linked to classified research. Some died under unexplained circumstances, while others vanished without trace, prompting the FBI to lead a coordinated review alongside the Department of Energy, Department of Defense and NASA.

House Oversight Committee Chairman James Comer, R-Ky., said Monday the panel has demanded briefings from the four agencies, expressing concern that "something sinister could be happening." Comer noted the individuals had access to highly sensitive information involving rocket technology, nuclear secrets and advanced aerospace programs, some connected to commercial space efforts by companies including SpaceX and Blue Origin.

Among the cases drawing scrutiny is the 2023 death of Michael David Hicks, a longtime NASA Jet Propulsion Laboratory scientist who worked nearly 25 years on projects including asteroid deflection technology. His passing was followed by the death of Frank Maiwald, a 61-year-old JPL space research specialist, in Los Angeles in 2024. Monica Jacinto Reza, 60, director of JPL's Materials Processing Group and involved in advanced alloy research, disappeared while hiking in a Los Angeles-area forest in June 2025.

Other notable incidents include the fatal shooting of MIT nuclear physicist Nuno Loureiro outside his Massachusetts home and the homicide of Caltech astrophysicist Carl Grillmair. Retired Air Force Maj. Gen. William........

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