Trending Now - Federal Inquiry Launched Into Mysterious Deaths of Scientists

WHO:

CNN - William Neil McCasland, a retired Air Force major general, was reported missing after leaving his Albuquerque, New Mexico home on February 27, 2026, with only a .38 caliber revolver.

CNN - Nuno F.G. Loureiro, a 47-year-old nuclear physicist and MIT professor, was fatally shot outside his residence in Massachusetts in December 2025.

CNN - Carl Grillmair, a 67-year-old astrophysicist at Caltech, was fatally shot at his home outside Los Angeles on February 16, 2026.

Gizmodo - Monica Jacinto Reza, a 60-year-old aerospace engineer who worked on rocket engines at NASA’s Jet Propulsion Laboratory, disappeared on June 22, 2025.

CNN - Frank Maiwald, a senior radio frequency engineer at JPL, died on July 4, 2024, at the age of 61.

CNN - Michael David Hicks, a JPL research scientist who studied comets and asteroids, died on July 30, 2023, at the age of 59.

CNN - William Neil McCasland, a retired Air Force major general, was reported missing on February 27, 2026.

CNN - Nuno F.G. Loureiro, a 47-year-old nuclear physicist and MIT professor, was fatally shot outside his residence in Massachusetts in December 2025.

CNN - Carl Grillmair, a 67-year-old astrophysicist at Caltech, was fatally shot at his home outside Los Angeles in February 2026.

CNN - Melissa Casias, a 53-year-old employee at Los Alamos National Laboratory, was last seen walking on a highway near Talpa, New Mexico, in June 2025.

CNN - Anthony Chavez, a 78-year-old retiree who worked at Los Alamos National Laboratory, disappeared in May 2025.

Gizmodo - NASA Press Secretary Bethany Stevens stated, “At this time, nothing related to NASA indicates a national security threat. The agency is committed to transparency and will provide more information as able.”

CNN - William Neil McCasland, a retired Air Force major general, was reported missing after leaving his Albuquerque, New Mexico home on February 27, 2026.

IJR - The FBI is probing reports of at least 10 missing or dead scientists and staff working in U.S. nuclear or space technology.

Gizmodo - The Trump administration has launched an investigation into the disappearances and deaths of 11 American scientists.

CNN - House Oversight and Government Reform Committee Chair James Comer (R-KY) expressed concern about the situation.

CNN - NASA Press Secretary Bethany Stevens stated that NASA is coordinating with relevant agencies regarding the missing scientists.

WHAT:

Fortune - The House Oversight Committee formally demanded answers from four federal agencies on April 17, 2026, regarding the deaths and disappearances of at least 11 American scientists and researchers with ties to NASA, nuclear research, and classified defense programs.

Fortune - The letters sent by the committee requested staff-level briefings no later than April 27, 2026.

CNN - The House Oversight Committee announced it will seek briefings on the matter from the FBI, the Defense Department, the Department of Energy, and NASA.

CNN - The investigation is being carried out “in light of the recent and legitimate questions” regarding the recent cases, according to White House Press Secretary Karoline Leavitt.

CNN - The investigation began in 2023 with the death of Michael David Hicks, a NASA scientist.

Fortune - The letters sent by the committee requested staff-level briefings no later than April 27, 2026.

CNN - The investigation is being carried out “in light of the recent and legitimate questions” regarding the recent cases, according to White House Press Secretary Karoline Leavitt.

Fortune - The letters sent by the committee requested staff-level briefings no later than April 27, 2026.

CNN - The House Oversight Committee announced it will seek briefings on the matter from the FBI, the Defense Department, the Department of Energy, and NASA.

CNN - The investigation is being carried out “in light of the recent and legitimate questions” regarding the recent cases, according to White House Press Secretary Karoline Leavitt.

IJR - Reports indicate at least 10 scientists are missing or dead.

Gizmodo - Three of the 11 scientists had direct ties to NASA, and the investigation includes concerns about national security.

CNN - The House Oversight Committee announced it will investigate the deaths and disappearances of individuals with access to sensitive scientific information.

CNN - The investigation began in 2023 with the death of Michael David Hicks, a NASA scientist.

WHERE:

Gizmodo - Monica Jacinto Reza disappeared while hiking in Los Angeles County, California.

CNN - Nuno F.G. Loureiro was fatally shot outside his residence in Massachusetts.

CNN - William Neil McCasland went missing from his home in Albuquerque, New Mexico.

CNN - Frank Maiwald died in Los Angeles, California.

WHEN:

CNN - The investigation into the deaths and disappearances began in 2023, with the death of Michael David Hicks on July 30, 2023.

CNN - William Neil McCasland was reported missing on February 27, 2026.

CNN - The investigation into the deaths and disappearances began in 2023, with the death of Michael David Hicks on July 30, 2023.

Gizmodo - Monica Jacinto Reza disappeared on June 22, 2025.

Gizmodo - Frank Maiwald died on July 4, 2024.

Gizmodo - Michael David Hicks died on July 30, 2023.

CNN - Nuno F.G. Loureiro was shot in December 2025.

CNN - Carl Grillmair was shot in February 2026.

CNN - William Neil McCasland was reported missing on February 27, 2026.

WHY:

Fortune - House Oversight Committee Chairman James Comer stated, “If the reports are accurate, these deaths and disappearances may represent a grave threat to U.S. national security and to U.S. personnel with access to scientific secrets.”

CNN - House Oversight Chair James Comer stated, “It’s very unlikely that this is a coincidence,” emphasizing the national security threat posed by the situation.

Gizmodo - The investigation is prompted by concerns over the strategic sensitivity of the fields the scientists were involved in, including nuclear weapons security and space missions.

CNN - The House Oversight Committee stated the reports raise questions about a possible sinister connection between the deaths and disappearances.

HOW:

Fortune - The FBI is formally investigating the deaths and disappearances of the scientists, working with the Department of Energy, Department of War, and state and local law enforcement partners.

CNN - The White House is “actively working with all relevant agencies and the FBI to holistically review all of the cases together and identify any potential commonalities that may exist,” according to White House Press Secretary Karoline Leavitt.

Fortune - The FBI is formally investigating the deaths and disappearances of the scientists, working with the Department of Energy, Department of War, and state and local law enforcement partners.

CNN - The White House is working with federal agencies to probe potential links between the deaths and disappearances.

CNN - NASA is coordinating and cooperating with relevant agencies regarding the missing scientists.

(UPDATED April 22, 2026 15:21 UTC)

The House Oversight Committee has formally demanded answers from four federal agencies regarding the deaths and disappearances of at least 11 American scientists and researchers with ties to NASA and classified defense programs, with letters requesting briefings by April 27th. This investigation, which began in 2023 following the death of Michael David Hicks, has gained urgency after the recent disappearance of retired Air Force Major General William Neil McCasland and the fatal shootings of nuclear physicist Nuno F.G. Loureiro and astrophysicist Carl Grillmair. House Oversight Chair James Comer has expressed concern that these incidents may pose a grave threat to U.S. national security, prompting the FBI to collaborate with various agencies to investigate the matter further.

(UPDATED April 22, 2026 05:42 UTC)

The House Oversight Committee has formally demanded answers from four federal agencies regarding the deaths and disappearances of at least 11 American scientists and researchers linked to NASA and classified defense programs, with requests for briefings due by April 27th. This investigation, which began in 2023 following the death of NASA scientist Michael David Hicks, is being conducted in light of serious national security concerns, as emphasized by House Oversight Chair James Comer. The FBI is leading the investigation in collaboration with the Department of Energy, the Department of War, and local law enforcement, while the White House is working closely with these agencies to identify any potential connections among the cases.

(UPDATED April 22, 2026 03:58 UTC)

The House Oversight Committee has formally demanded answers from four federal agencies regarding the deaths and disappearances of at least 11 American scientists and researchers, with letters requesting briefings by April 27th. This investigation follows the recent disappearance of aerospace engineer Monica Jacinto Reza and the deaths of several other scientists, raising serious national security concerns according to House Oversight Chairman James Comer. The FBI is now involved, collaborating with various federal and local agencies to look into these troubling cases.

(UPDATED April 21, 2026 23:10 UTC)

The House Oversight Committee has formally demanded answers from four federal agencies regarding the deaths and disappearances of at least 11 American scientists and researchers, with letters requesting briefings by April 27th. This investigation, which began in 2023 following the death of Michael David Hicks, has drawn attention to the tragic incidents involving individuals like Nuno F.G. Loureiro and Carl Grillmair, who were both fatally shot in separate incidents. Chairman James Comer expressed concerns that these cases could pose a serious threat to U.S. national security, as the FBI collaborates with various agencies to uncover the truth behind these alarming events.

(UPDATED April 21, 2026 21:15 UTC)

NASA Press Secretary Bethany Stevens confirmed that there is currently no indication of a national security threat related to recent investigations, while the House Oversight Committee is seeking briefings from the FBI, Defense Department, Department of Energy, and NASA. This investigation, which began with the death of Michael David Hicks July 30thth, 2023, has raised legitimate concerns, prompting House Oversight Chair James Comer to suggest that the situation is unlikely to be a coincidence. The White House is actively collaborating with relevant agencies and the FBI to review all cases and identify any potential commonalities that may exist.

(UPDATED April 21, 2026 19:22 UTC)

The FBI is investigating reports of at least 10 missing or dead scientists and staff involved in U.S. nuclear or space technology, with the Trump administration also launching an inquiry into the deaths of 11 American scientists, three of whom had direct ties to NASA. House Oversight Committee Chair James Comer expressed concern about the situation, noting that the investigation began in 2023 following the death of NASA scientist Michael David Hicks, and includes cases such as the disappearance of Monica Jacinto Reza in Los Angeles County and the fatal shooting of Nuno F.G. Loureiro in Massachusetts. NASA Press Secretary Bethany Stevens stated that the agency is coordinating with relevant federal agencies to address the strategic sensitivity of the fields these scientists were involved in, which raises questions about a possible sinister connection between the incidents.