The Missing and the Dead: 10 Mysterious Cases of American Scientists (2023–2026)

In early 2026, a unsettling pattern emerged within the American scientific community. Since 2023, a series of disappearances and deaths involving researchers at the forefront of nuclear physics, aerospace engineering, and national security have triggered a federal probe. While some cases point to personal tragedy, the sheer concentration of high-level experts vanishing—often leaving behind their phones, wallets, and keys—has fueled intense public speculation.

Here is a look at 10 scientists and high-ranking officials whose cases have drawn national attention.

1. Nuno Loureiro (MIT)

Status: Deceased (December 2025) A titan in the world of nuclear fusion, Loureiro was the Director of MIT’s Plasma Science and Fusion Center. In December 2025, he was shot at his home in Brookline, Massachusetts. His work was pivotal for the future of clean energy and high-energy density physics. His death is currently being investigated as a homicide.

2. William "Neil" McCasland (U.S. Air Force)

Status: Missing (February 2026) A retired Major General and former commander of the Air Force Research Laboratory (AFRL), McCasland oversaw billions in classified research. He vanished from his Albuquerque home in February 2026, leaving his car and wallet but carrying a .38-caliber revolver. Despite a Silver Alert and massive search, no trace has been found

3. Monica Jacinto Reza (Aerojet Rocketdyne/NASA)

Status: Missing (June 2025) Reza was a senior aerospace engineer and a Technical Fellow specializing in advanced rocket propulsion. She vanished while hiking on the Mount Waterman Trail in California. Unusually, her phones were later discovered to have been factory-reset. Her professional ties to McCasland through defense projects have added a layer of intrigue to her case.

4. Anthony Chavez (Los Alamos National Laboratory)

Status: Missing (May 2025) A veteran of the Los Alamos National Laboratory (LANL), where the world’s most sensitive nuclear research is conducted, the 79-year-old Chavez went for a walk in New Mexico and never returned. Like several others on this list, he left his essentials—car, keys, and wallet—behind.

5. Melissa Casias (Los Alamos National Laboratory)

Status: Missing (June 2024) An administrative employee at LANL with Top Secret clearance, Casias disappeared under strange circumstances. After forgetting her work badge, she returned home to work remotely and was never seen again. Despite being a "non-scientist," her access to sensitive personnel and project data made her disappearance a high-priority national security concern.

6. Carl Grillmair (Caltech/NASA)

Status: Deceased (February 2026) A renowned Caltech astrophysicist who worked on NASA’s NEOWISE and NEO Surveyor missions (tracking asteroids and near-Earth objects). Grillmair was shot to death on his front porch in Llano, California. The motive for the killing remains unknown, leaving the scientific community in shock

7. Frank Maiwald (NASA JPL)

Status: Deceased (July 2024) A principal researcher at NASA’s Jet Propulsion Laboratory, Maiwald was an expert in advanced space instrumentation. He died in Los Angeles, but the case became a talking point when it was revealed that no autopsy was performed and no cause of death was ever released to the public.

8. Steven Garcia (KCNSC/DOE)

Status: Missing (2025) Garcia was a government contractor at the Kansas City National Security Campus, a facility responsible for the non-nuclear components of the U.S. nuclear arsenal. His disappearance fits the "walk-away" profile seen in other cases, where the individual vanishes on foot from a secure routine.

9. Michael David Hicks (NASA JPL)

Status: Deceased (July 2023) A research scientist at JPL who contributed to the DART Project (the first-ever planetary defense mission). Hicks died suddenly in 2023. Similar to Maiwald, the lack of a disclosed cause of death initially went unnoticed but has since been scrutinized as part of the "Scientist 10" pattern.

10. Jason Thomas (Novartis/Biochemical Research)

Status: Deceased (March 2026) While primarily a pharmaceutical researcher, Thomas’s work in chemical biology intersected with high-level biochemical systems. He disappeared in December 2025 and was found dead in a Massachusetts lake three months later. Though some evidence suggests a personal struggle, his inclusion in the probe stems from the timing of his disappearance alongside Loureiro and McCasland.