The Dead Scientists: Six Researchers with Nuclear and UAP Ties Dead or Missing in 2026 -

In the span of nine months, from June 2025 to March 2026, six American scientists with connections to nuclear research, advanced aerospace, and defense technology have turned up dead or vanished without explanation. Three were murdered by gunshot. Three disappeared while hiking or walking away from their homes, and none have been found.

The cases span five states, three branches of the military-industrial complex, and fields ranging from nuclear fusion to exoplanet astronomy to rocket propulsion. They have attracted the attention of Congress, former FBI officials, and a public increasingly alarmed by what some are calling a pattern too specific to ignore.

None of the six cases have been officially linked. Law enforcement in each jurisdiction has investigated independently. But the overlaps, institutional, geographic, and chronological, have grown impossible to dismiss.

The Six Cases

1. Melissa Casias, 54, Los Alamos National Laboratory

Melissa Casias worked as an administrative assistant at Los Alamos National Laboratory (LANL), one of America’s most sensitive nuclear research facilities. The lab, established during the Manhattan Project in 1943, remains central to U.S. nuclear weapons research and stockpile stewardship. Casias also served on a Department of Energy advisory board. Her husband held a senior position as a Superintendent III at the laboratory.

On June 26, 2025, Casias told her family she would work from home. Instead, she was last seen miles from her house in Taos, New Mexico, walking alone without her wallet, phone, or keys. She reportedly reset her phones before leaving, an act that, according to former FBI officials, suggests deliberate effort to avoid tracking.

She has not been found. Her case remains unsolved.

Former FBI Assistant Director Chris Swecker has pointed to Casias’s role at LANL as a potential vulnerability, suggesting her work at the nuclear facility may have made her a target. He noted that LANL employees with even administrative access to classified programs could be targets for foreign intelligence services. The FBI has not publicly confirmed any connection to other cases.

2. Monica Jacinto Reza, NASA Jet Propulsion Laboratory

Monica Jacinto Reza was a materials engineer and co-inventor of Mondaloy, a specialized rocket alloy used in advanced propulsion systems. She served as Director of the Materials Processing Group at NASA’s Jet Propulsion Laboratory (JPL) and had previously worked at Aerojet Rocketdyne, with research funded by both NASA and the Air Force Research Laboratory (AFRL).

Reza used the professional name Monica Jacinto during her years at Aerojet Rocketdyne, which is why earlier reports used different names for the same person. She was a senior figure in U.S. rocket propulsion research, the kind of scientist whose work sat at the intersection of national security and deep space exploration.

In the summer of 2025, Reza was last seen hiking on the Mount Waterman Trail in the Angeles National Forest in Los Angeles County. Despite search efforts including a coordinated operation on August 8, 2025, no trace of her has been found. No personal belongings, clothing, or remains have been recovered.

As of March 2026, Reza remains missing. Her case gained national attention when observers noted her professional connection to retired Major General William Neil McCasland, who oversaw the Air Force Research Laboratory program that funded her work at Aerojet Rocketdyne. Both vanished while on or near hiking trails in the American Southwest, McCasland near the Sandia Mountain foothills in Albuquerque, Reza in the San Gabriel Mountains above Los Angeles.

3. Nuno Loureiro, 47, MIT Plasma Science and Fusion Center

Nuno F.G. Loureiro was a Portuguese-born plasma physicist and the Herman Feshbach Professor of Physics at MIT. He directed the university’s Plasma Science and Fusion Center, the same facility where researchers have been working on achieving practical nuclear fusion, a technology that, if perfected, would fundamentally reshape global energy markets. Loureiro was recognized internationally for his contributions to nuclear fusion research and plasma physics, having twice received major awards for his work on “Basic Plasma Science” and “MHD Theory of Fusion Systems.”

On the evening of December 15, 2025, Loureiro was shot multiple times in the foyer of his apartment building in Brookline, Massachusetts. He died from his wounds the following day.

The shooter was identified as Claudio Neves Valente, who had carried out a shooting rampage at Brown University earlier that same day before driving to Brookline. The Providence Journal documented nearly 100 pages of police reports describing the attack as calculated rather than random. Valente had posed as a delivery driver while roaming the Brookline neighborhood for hours before ambushing Loureiro. The motive for targeting Loureiro specifically has not been publicly established.

MIT President Sally Kornbluth called Loureiro’s death a devastating loss to the scientific community. Colleagues noted that Loureiro had been on the verge of a significant breakthrough in nuclear fusion technology, work that, if successful, could have produced unlimited clean energy.

4. Jason Thomas, 45, Novartis

Jason Thomas was a chemical biologist at multinational pharmaceutical corporation Novartis. His research focused on developing new medicines, including potential cancer treatments, and he held active contracts with the Department of Defense.

Thomas was reported missing on December 13, 2025, after leaving his home in Wakefield, Massachusetts, around midnight. His wife told investigators he had been struggling with the recent deaths of his parents.

On March 17, 2026, after the winter ice on Lake Quannapowitt thawed, police recovered a body from the lake. Clothing confirmed the victim as Thomas. The Wakefield Police Department said the cause of death still needed to be determined but stated that “no foul play is suspected.”

5. Carl Grillmair, 67, Caltech

Carl Grillmair was an accomplished Caltech astrophysicist with more than four decades of research contributions in galactic astronomy and the study of distant planets. A University of Calgary graduate whose parents were mountaineering pioneers in Western Canada, Grillmair had spent his career at the intersection of deep-space observation and planetary science. His work contributed to the discovery of water on an exoplanet, and colleagues described his research as potentially significant for identifying signs of life within 160 light-years of Earth.

On the morning of February 16, 2026, at approximately 6:00 AM, Grillmair was shot and killed on the front porch of his home in Llano, a remote community in California’s Antelope Valley. He was found with a gunshot wound to the torso. Paramedics pronounced him dead at the scene.

The suspect, Freddy Snyder, 29, was arrested. What made the case particularly troubling was a prior incident: Snyder had been arrested two months earlier for trespassing on Grillmair’s property while carrying a loaded rifle. A Newsom-appointed judge dismissed those charges under California Penal Code 1385, a discretionary dismissal provision. Eleven days later, Snyder allegedly murdered Grillmair.

Investigators found no evidence that Snyder and Grillmair knew each other. The LA Times reported the case as a “deepening mystery,” noting the randomness of a stranger targeting a scientist living in a remote desert area. The Los Angeles County Board of Supervisors adjourned in Grillmair’s memory, with Supervisor Kathryn Barger honoring his decades of groundbreaking space research.

6. William Neil McCasland, 68, Retired Air Force Major General

Retired Major General William Neil McCasland was one of the most accomplished military scientists of his generation. He oversaw the Air Force’s $2.2 billion science and technology program at Wright-Patterson Air Force Base and was considered one of the military’s leading experts on UFOs and classified aerospace programs. Wright-Patterson has been at the center of UAP lore since the 1947 Roswell incident, the base was long rumored to house recovered materials from the crash.

McCasland was named in the 2016 WikiLeaks emails as an advisor to Tom DeLonge during the formation of To The Stars Academy, the organization that helped bring the Pentagon’s UAP program to public attention. According to those emails, McCasland had advised DeLonge on disclosure matters and helped assemble his advisory team.

On February 27, 2026, McCasland walked out of his Albuquerque, New Mexico, home and vanished. He left behind his phone, his wearable devices, and his prescription glasses. Clothing was later found near his home. He has not been seen since.

ABC News confirmed McCasland’s disappearance on March 9, 2026. Investigative journalist Ross Coulthart told NewsNation that McCasland was “a man with some of the most sensitive U.S. military intelligence secrets in his head, especially particle beam technology.” He remains missing.

For a deeper look at McCasland’s career and his connection to Wright-Patterson, see our full article: The Missing General: McCasland and Wright-Patterson.

The Connections

When laid out side by side, the connections between these cases are striking enough that they have attracted congressional attention.

Institutional overlap. Casias worked at Los Alamos National Laboratory. Reza worked at Aerojet Rocketdyne on programs funded by the Air Force Research Laboratory, the same facility McCasland oversaw. McCasland himself was connected to Wright-Patterson, the base long rumored to house recovered materials from the 1947 Roswell incident.

Geographic clustering. Two of the missing individuals, Casias and McCasland, disappeared in New Mexico within months of each other. Both vanished while reportedly heading toward mountains or wilderness. Reza disappeared on a hiking trail in California’s San Gabriel Mountains.

Shared fields. Of the six individuals, five had direct ties to nuclear research, advanced propulsion, or defense technology. The sixth, Jason Thomas, held Department of Defense contracts through Novartis.

Timeline compression. All six cases occurred within nine months. Three of the deaths happened within a five-week span: Thomas’s body found March 17, Grillmair killed February 16, and McCasland disappeared February 27.

Congressional Response

Tennessee Congressman Tim Burchett, who has been a vocal advocate for UAP transparency since the 2023 congressional hearings, told the Daily Mail he sees a clear and disturbing pattern.

“Let’s be honest about what we are looking at,” Burchett said. “A Pentagon official with direct ties to UFO reverse-engineering programs disappears without his phone or glasses. A rocket alloy inventor working under his program vanishes on a hike. A fusion energy pioneer is assassinated in his home. An astrophysicist whose work points toward life beyond Earth is shot on his porch at dawn. A cancer researcher with Defense Department contracts turns up dead. All within a handful of months.”

Burchett noted that several of the researchers were working on things “directly connected to theories about extraterrestrial spacecraft and advanced propulsion.”

Former FBI Assistant Director Chris Swecker has urged federal agencies to investigate the cases as part of a broader pattern rather than as isolated incidents, pointing specifically to Casias’s role at LANL as a potential security vulnerability.

What Is Known vs. What Is Not

It is important to distinguish between established facts and speculation.

What is established: Six scientists connected to nuclear research, aerospace, or defense technology are dead or missing within nine months. Three were murdered. Three vanished. No suspects have been identified in any of the disappearances. In Grillmair’s case, the suspect had been arrested on the victim’s property two months earlier, and the charges were dropped.

What is not established: Whether any of these cases are connected. Whether any are related to UAP research specifically. Whether any foreign government, domestic agency, or private entity is involved. Law enforcement in each jurisdiction has investigated their case independently. No publicly available evidence confirms coordination between the cases.

What raises questions: The institutional overlap between victims. The geographic clustering in the Southwest. The shared fields of nuclear and aerospace research. The compressed timeline. The specific detail in Grillmair’s case that his alleged killer was arrested on his property and released eleven days before the murder. The detail in Casias’s case that she reset her phones before vanishing. The detail in McCasland’s case that he left all tracking devices behind. The fact that Reza and Casias both worked at facilities connected to McCasland’s Air Force Research Laboratory.

The Broader Context

The pattern emerges against a backdrop of escalating UAP disclosure activity in Washington. In February 2026, President Trump pledged to release UFO-related files. Secretary of Defense Hegseth doubled down on the commitment. AARO‘s caseload exceeded 2,000 documented incidents. The government registered the domain aliens.gov. Congress held multiple hearings on unidentified anomalous phenomena.

Whether the deaths and disappearances of these six scientists are connected to this broader disclosure push, or whether the timing is coincidental, remains an open question. What is not open to debate is that accomplished researchers in America’s most sensitive scientific fields are disappearing and dying at a rate that has alarmed lawmakers, former law enforcement officials, and the public.

The last time scientists connected to sensitive military programs died or disappeared in clusters was during the Cold War, when Soviet intelligence operations targeted Western nuclear and aerospace researchers. Whether a similar dynamic is playing out today, or whether something entirely different is at work, remains to be seen.

As Burchett put it: “If this pattern involved any other profession, it would be national news around the clock.”

The Dead Scientists: Six Researchers with Nuclear and UAP Ties Dead or Missing in 2026