What Happened to FBI Investigation into Deaths and Disappearances of Scientists Tied to Sensitive US Research?
The FBI, in coordination with the White House and Department of Energy, has launched a broad investigation into the deaths and disappearances of at least 10 scientists connected to sensitive U.S. nuclear and aerospace research since 2023. While some cases have local explanations, federal agencies are conducting a "holistic review" to identify any potential connections, including links to classified information or foreign actors, amidst ongoing concerns about foreign espionage targeting the U.S. space industry.
Quick Answer
As of April 22, 2026, the FBI is spearheading a comprehensive investigation into the deaths and disappearances of at least 10 scientists involved in sensitive U.S. aerospace and nuclear research, with the White House and House Oversight Committee also conducting parallel reviews. The probe aims to determine if there are any connections between these incidents, including potential foreign interference or access to classified information, though no definitive links have been established yet.
📊Key Facts
📅Complete Timeline14 events
JPL Scientist Michael David Hicks Dies
Michael David Hicks, a scientist at NASA's Jet Propulsion Laboratory (JPL) specializing in comets and asteroids, dies at age 59. His cause of death was not disclosed.
US Agencies Warn of Foreign Espionage in Space Industry
The National Counterintelligence and Security Center (NCSC), FBI, and US Air Force issue a joint advisory warning that foreign intelligence entities (FIEs) are targeting the US space industry for intellectual property theft and sensitive data.
JPL Physicist Frank Maiwald Dies
JPL physicist Frank Maiwald dies at age 61. His cause of death was not disclosed.
Los Alamos Scientist Anthony Chavez Disappears
Anthony Chavez, a retiree who worked at Los Alamos National Laboratory, disappears from his home in Los Alamos, New Mexico. No signs of foul play were found.
Aerospace Engineer Monica Jacinto Reza Disappears
Monica Jacinto Reza, an aerospace engineer at NASA's Jet Propulsion Laboratory and Aerojet Rocketdyne, disappears while hiking near Mount Waterman in the Angeles National Forest. Her body has not been found.
Los Alamos Employee Melissa Casias Disappears
Melissa Casias, an employee at Los Alamos National Labs, disappears after being seen walking alone in Taos County, New Mexico. Her phones were factory reset.
MIT Professor Nuno Loureiro Killed, Novartis Scientist Jason Thomas Missing
MIT Professor Nuno Loureiro, an expert in fusion and plasma physics, is fatally shot outside his Massachusetts home. Separately, Novartis scientist Jason Thomas goes missing from Wakefield, Massachusetts.
DCSA Report Highlights Human-Focused Espionage Tactics
The Defense Counterintelligence and Security Agency (DCSA) releases a report stating that foreign adversaries are increasingly using tactics like resume submissions and expert consultations to steal U.S. technology.
Caltech Astrophysicist Carl Grillmair Fatally Shot
Caltech astrophysicist Carl Grillmair is fatally shot on the porch of his Llano home. A suspect, Freddy Snyder, is arrested and charged with murder.
Retired Air Force General William Neil McCasland Disappears
Retired Air Force Major General William Neil McCasland, who commanded advanced aerospace research, goes missing from his New Mexico home.
Body of Jason Thomas Recovered
The body of Novartis scientist Jason Thomas, who went missing in December 2025, is recovered from Lake Quannapowitt. Police find no evidence of foul play.
White House Announces 'Holistic Review'
The White House announces a "holistic review" into the 11 scientists who have died or vanished since 2024, working with the FBI and Department of Energy to identify potential commonalities.
House Oversight Committee Launches Parallel Probe
The House Oversight Committee announces its own investigation into the deaths and disappearances, citing national security concerns and seeking information from federal agencies and NASA.
FBI Confirms Broad Investigation into Scientists' Cases
The FBI confirms it is "spearheading the effort to look for connections into the missing and deceased scientists," working with multiple agencies to find answers amidst growing national security concerns.
🔍Deep Dive Analysis
The United States has been grappling with a growing concern over foreign intelligence entities (FIEs) systematically targeting its burgeoning space industry, which is projected to exceed $1 trillion by 2030. Warnings issued by the FBI, National Counterintelligence and Security Center (NCSC), and the Office of the Director of National Intelligence in August 2023 highlighted the significant threat posed by FIEs, particularly from China, Russia, and Iran, through cyberattacks, supply chain exploitation, and illicit acquisition of intellectual property and sensitive data.
This long-standing threat has taken on a new dimension with a recent string of mysterious deaths and disappearances involving at least 10 scientists and staff connected to highly sensitive U.S. nuclear and aerospace research. These incidents, occurring since 2023, have prompted a broad federal investigation led by the FBI, with the White House and the House Oversight Committee launching their own reviews.
Key turning points in this unfolding story include the deaths of Michael David Hicks (JPL, July 2023) and Frank Maiwald (JPL, 2024), whose causes of death were not disclosed. More recently, Monica Jacinto Reza, a prominent aerospace engineer at NASA's Jet Propulsion Laboratory (JPL), disappeared in June 2025 while hiking in the Angeles National Forest, with no trace found despite extensive searches. In December 2025, MIT fusion scientist Nuno Loureiro was fatally shot, and in February 2026, Caltech astrophysicist Carl Grillmair was murdered at his home, leading to an arrest in the latter case. Additionally, retired Air Force Major General William Neil McCasland, who commanded advanced aerospace research, went missing in February 2026.
The FBI confirmed on April 22, 2026, that it is "spearheading the effort to look for connections into the missing and deceased scientists," working with the Department of Energy, Department of War, and local law enforcement. The White House is conducting a "holistic review" to identify any potential commonalities, including links to classified access or foreign actors. While some local authorities have attributed certain deaths to personal struggles or have made arrests, federal investigators are examining whether a larger, coordinated plot or foreign interference is at play. House Oversight Committee Chairman James Comer has described the situation as a "grave threat to U.S. national security."
As of April 22, 2026, the investigation is ongoing, and authorities have not yet established any definitive links between all the cases. NASA has stated that "nothing related to NASA indicates a national security threat" at this time, but FBI Director Kash Patel has affirmed that arrests would be made if evidence of nefarious conduct or conspiracy is uncovered. The DCSA also reported in January 2026 that foreign adversaries are increasingly using human-focused tactics, such as resume submissions and expert consultations, to steal U.S. technology, underscoring the persistent counterintelligence challenges facing the U.S. scientific and defense sectors.
What If...?
Explore alternate histories. What if FBI Investigation into Deaths and Disappearances of Scientists Tied to Sensitive US Research made different choices?