FBI and Congress Probe Suspicious Deaths of US Nuclear Scientists

Key Takeaways

• FBI and House Oversight Committee launch joint probes into at least 10 missing or deceased experts.
• Officials confirm no links established yet despite rising public speculation about sinister connections.
• Families and committee members offer conflicting views on whether the incidents constitute a national security threat.

The FBI is spearheading a federal effort to investigate the deaths and disappearances of at least ten individuals connected to sensitive US nuclear and aerospace research. This inquiry follows a string of mysterious incidents involving experts that has sparked intense speculation regarding potential foul play.

Republican-led House Oversight Committee members have announced a formal investigation into these events, citing concerns about a possible sinister connection between the cases. The committee has requested briefings from the FBI, Defense Department, Department of Energy, and NASA to determine if these tragedies are linked.

While the FBI, the White House, and various agencies are coordinating to find answers, officials have stated that no links between the cases have been established. The White House, with President Donald Trump characterizing the matter as "pretty serious stuff," is working with federal agencies to holistically review the cases for any commonalities.

The String of Disappearances and Deaths

The timeline of these incidents reportedly began in 2023 with the death of Michael David Hicks, a 59-year-old scientist who worked at NASA's Jet Propulsion Laboratory for nearly 25 years. Hicks, who specialized in comets and asteroids, died on July 30, 2023, though the cause of death was not disclosed. His daughter, Julia Hicks, told CNN that her father was struggling with known medical issues and expressed confusion over the speculation implicating him in a federal investigation into a conspiracy.

"In at least two instances, families have pointed to preexisting medical conditions or personal struggles as explanations," the report noted, highlighting that authorities have not established any links between the cases despite the varying circumstances.

Following Hicks, several others connected to the Jet Propulsion Laboratory have died or gone missing. Frank Maiwald, a space research specialist, died in Los Angeles in 2024 at the age of 61. Monica Reza, a 60-year-old aerospace engineer and director of the NASA Lab's Materials Processing Group, disappeared while hiking in a Los Angeles forest in June 2025.

The situation gained further urgency with the disappearance of William Neil McCasland, a retired Air Force major general. McCasland walked out of his Albuquerque, New Mexico, home on February 27 without his phone, prescription glasses, or wearable devices. He had been at the center of Pentagon advanced aerospace research and formerly commanded the Air Force Research Laboratory at Wright-Patterson Air Force Base.

His wife, Susan McCasland Wilkerson, disputed rumors linking his disappearance to extraterrestrial debris stored at the base, stating that her husband had no special knowledge of such materials. She noted that his brief association with the UFO community was not a motive for abduction and that no sightings of a mothership had been reported.

Two other individuals, Melissa Casias and Anthony Chavez, who worked at the Los Alamos National Laboratory, also went missing in 2025. Casias, 53, was last seen on a highway near Talpa, New Mexico, leaving behind a factory-reset phone. Chavez, a 78-year-old foreman, disappeared in May 2025. While New Mexico authorities stated no foul play was suspected, exhaustive searches for Chavez yielded no signs of activity or intent to leave.

Recent Fatalities Fuel Speculation

In recent months, the aerospace engineer deaths and fatalities of other acclaimed scientists have fueled further speculation about a coordinated motive. Nuno F.G. Loureiro, a 47-year-old physicist and professor at the Massachusetts Institute of Technology, was fatally shot at his home near Boston in December 2025 by a gunman who also killed two students at Brown University. Loureiro had led the MIT Plasma Science and Fusion Center.

Carl Grillmair, a 67-year-old astrophysicist from the California Institute of Technology, was shot at his home outside Los Angeles in February. Grillmair was renowned for studies on searching for water on exoplanets and collaborated with NASA. Authorities arrested a suspect but stated they did not believe the suspect knew the victim.

Former US Air Force intelligence officer Matthew James Sullivan, 39, also died in 2024. Rep. Eric Burlison of Missouri urged the FBI to investigate, stating Sullivan died by suicide suspiciously just weeks before he was scheduled to testify in a federal whistleblower case about UFOs.

Additionally, the 2022 death of Amy Eskridge, 34, co-founder of the Institute for Exotic Science, has gained renewed attention. Her family described her as an intelligent person who suffered from chronic pain and urged the public not to overanalyze her death.

Congressional Response and Future Outlook

The US congressional investigation has become a priority for the House Oversight Committee, with Chair James Comer telling Fox News that it is "very unlikely that this is a coincidence." Comer emphasized that the committee views the matter as a national security threat.

However, Rep. James Walkinshaw, a Democrat on the committee, expressed skepticism about a coordinated motive. He noted that the US has thousands of nuclear scientists and experts, suggesting that a foreign adversary could not significantly impact the program by targeting just 10 individuals.

NASA spokesperson Bethany Stevens stated that "at this time, nothing related to NASA indicates a national security threat," though the agency is coordinating with other relevant agencies. President Trump recently told reporters he hopes the disappearances and deaths are random but acknowledged that the administration would have clarity within a week and a half following a recent meeting on the subject.

Federal Agencies Coordinate Review

The White House Press Secretary Karoline Leavitt confirmed that the administration is actively working with all relevant agencies and the FBI to holistically review all cases. As the nuclear scientists disappearances continue to spark debate, the focus remains on whether a pattern of criminal activity is driving these losses or if tragic coincidences are at play. The outcome of this federal probe will likely determine the future of security protocols for sensitive research personnel across the US.