Reports of multiple scientists connected to U.S. aerospace and defense programs who have died or gone missing since 2022 have drawn new attention following action by congressional investigators, though authorities have not confirmed any link between the cases.

Committee Chairman James Comer and Rep. Eric Burlison sent letters to Kash Reports of multiple scientists connected to U.S. aerospace and defense programs who have died or gone missing since 2022 have drawn new attention following action by congressional investigators, though authorities have not confirmed any link between the cases. The House Oversight Committee on Monday requested information from several federal agencies regarding the deaths and disappearances of at least 11 researchers with ties to organizations such as NASA and private companies including SpaceX and Blue Origin.

Committee Chairman James Comer and Rep. Eric Burlison sent letters to Kash Patel, Energy Secretary Chris Wright, Defense Secretary Pete Hegseth, and NASA Administrator Jared Isaacman, requesting staff-level briefings by April 27, Fortune magazine reported. “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,” the letters read.

On Monday, Comer, a Kentucky Republican, said he did not believe the deaths were a coincidence. “Once you see the facts, it would suggest that something sinister could be happening and it would be a national security concern,” Comer said. He added he and Burlison were looking to “see if we can put it together and find any missing links to try to solve what’s going on here. Because it’s very unlikely that this is a coincidence. Congress is very concerned about this. Our committee is making this one of our priorities now because we view this as a national security threat.”

In a statement to Fortune, the FBI added it “is spearheading the The White House officially acknowledged the pattern on April 15, when press secretary Karoline Leavitt was directly asked about it during a briefing
In a statement to Fortune, the FBI added it “is spearheading the The White House officially acknowledged the pattern on April 15, when press secretary Karoline Leavitt was directly asked about it during a briefing. “If true, of course, that’s definitely something I think this government and administration would deem worth looking into,” she responded.

Later that day, President Trump told reporters, “I don’t know. Hopefully, coincidence, whatever you want to call it. But some of them were very important people,” adding he would have answers within “the next week and a half.” He added: “I just left a meeting on that subject, so pretty serious stuff.”

In a post on X later in the week, Leavitt confirmed the administration “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,” adding, “No stone will be unturned.”

On Sunday, Patel confirmed that the bureau is investigating, telling Fox News’ Maria Bartiromo: We’re going to look for connections on whether there are connections to classified access, access to classified information, and or foreign actors.”
On Sunday, Patel confirmed that the bureau is investigating, telling Fox News’ Maria Bartiromo: We’re going to look for connections on whether there are connections to classified access, access to classified information, and or foreign actors.”

Patel then said, “If there’s any connections that lead to nefarious conduct or conspiracy, this FBI will make the appropriate arrest.”

In a statement to Fortune, the FBI added it “is spearheading the effort to look for connections into the missing and deceased scientists. We are working with the Department of Energy, Department of War, and with our state and local law enforcement partners to find answers.”

At this time, nothing related to NASA indicates a national security threat
NASA referred Fortune to its first statement on the matter, which was posted to the X platform: “NASA is coordinating and cooperating with the relevant agencies in relation to the missing scientists. 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.”

NASA is coordinating and cooperating with the relevant agencies in relation to the missing scientists. 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. https://t.co/92dTXGAxQn

— Bethany Stevens (@NASASpox) April 20, 2026

The Oversight Committee’s inquiry has focused in part on connections to NASA and nuclear research programs, but its focus is on the broader commercial space and defense sector in which many of the individuals worked
The Oversight Committee’s inquiry has focused in part on connections to NASA and nuclear research programs, but its focus is on the broader commercial space and defense sector in which many of the individuals worked. Experts note that fields such as planetary defense and nuclear research are relatively small, with a limited number of specialists focused on areas like asteroid tracking, deflection modeling, and space-based detection systems.

In March 2026, Blue Origin introduced its NEO Hunter concept, a planetary defense initiative developed in collaboration with Jet Propulsion Laboratory and California Institute of Technology.

The proposal is based on the company’s Blue Ring spacecraft platform and includes technologies such as ion-beam deflection and kinetic impact systems, which share underlying principles with certain missile detection and interception technologies, noted Fortune.