Physicist and science communicator Michio Kaku is warning that a growing number of scientists who have died or gone missing under unexplained circumstances should be treated as a national security issue rather than isolated incidents.
In comments to Fox News Digital published on Saturday, Kaku said the clustering of cases involving scientists with access to sensitive research is unprecedented and warrants coordinated government scrutiny.
“If 10 scientists suddenly die or vanish who all have access to sensitive research, this is cause for national concern,” he told the outlet.
Why It Matters
Kaku said that while a single unexplained death or disappearance may not signal a broader threat, a pattern involving multiple individuals with advanced security clearances significantly raises the stakes.
Many of the cases involve work in high‑security fields such as nuclear technology, aerospace systems, and classified defense research—areas tightly protected because of their strategic importance to national defense.
What to Know
Over the past several years, a number of scientists and former government researchers have died or gone missing under circumstances that have not been publicly explained. The individuals were connected to advanced research areas including nuclear science, aerospace engineering, and classified defense programs, prompting growing scrutiny from lawmakers and federal officials.
One of the most closely watched cases involves retired Air Force Major General William Neil McCasland, the former commander of the Air Force Research Laboratory, who disappeared from his New Mexico home earlier this year after reportedly leaving behind personal items such as his phone and glasses. McCasland previously worked on highly classified programs and had ties to Los Alamos National Laboratory, a core facility in U.S. nuclear weapons research.
Other cases have involved researchers affiliated with NASA’s Jet Propulsion Laboratory and private‑sector scientists working on federally funded projects. In some instances, remains were discovered months after disappearances were reported, while in other cases no public cause of death has been released. Authorities have emphasized that circumstances vary by case and that no official link has been publicly established.
A former colleague of two of the deceased scientists previously told Newsweek he doesn't believe the cases are connected by any coordinated or sinister plot.
"Sometimes, life is weird like that," said Dr. Joe Masiero, lead scientist for the Near-Earth Object Surveyor at the Infrared Processing and Analysis Center at the California Institute of Technology. "It’s really unfortunate to see a tragedy played out over and over again."
But Eric Burlison, a Missouri Republican, called for federal investigations, arguing unexplained deaths or disappearances involving scientists with national security ties should not be handled solely at the local level.
“This is too coincidental, and so we have to be investigating this,” the congressman told Fox & Friends on Friday. “We need to have our nation’s top investigators, the FBI and every agency looking into this matter.”
On Sunday, the congressman added in an X post: "We are in competition with China, Russia, and Iran on nuclear technology, advanced weapons, and space. Meanwhile, our top scientists keep vanishing. This has all the hallmarks of a foreign operation."
The White House has confirmed it is reviewing the cases together to determine whether overlaps exist in research focus, clearance levels, or employment histories.
President Donald Trump told reporters on Thursday he hoped the disappearances and deaths were "coincidence," but that White House officials would know more in the next week and a half.
"Some of them were very important people, and we're going to look at it over the next short period," Trump said.
Speaking during a White House press briefing on Wednesday, press secretary Karoline Leavitt said the administration was aware of the reports and would consult relevant agencies, but emphasized that no connection had been confirmed, adding each case appears to have its own circumstances.
“If true, of course, that's definitely something I think this government and administration would deem worth looking into,” she said.
Leavitt added in a Friday X post that the FBI would be involved: "In light of the recent and legitimate questions about these troubling cases, and President Trump’s commitment to the truth, 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. No stone will be unturned in this effort, and the White House will provide updates when we have them."
Kaku described the situation on Saturday as “unheard of,” saying he could not recall a comparable episode in his decades of work in physics and science policy. He stressed that conclusions should be driven by evidence rather than speculation, with investigators focused on whether a shared research domain or classified program connects the cases.
On Monday, April 20, the House Oversight Committee announced on X that Representative James Comer—who chairs the committee—and Burlison "are seeking to uncover the truth behind missing scientists. We’re requesting info from the FBI, NASA, and the Departments of War and Energy that will help us investigate this matter and protect our country."
Comer told Fox News on Monday:
"It does appear that there's a high possibility that something sinister is taking place here...What I've found in three and a half years as chairman of the House Oversight Committee is sometimes government agencies don't do a good job of sharing information on situations like this. So, we've asked all those agencies—the Department of Energy, NASA, the Department of War—to all share information with us so that we can 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. So, 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."
What Happens Next
Federal investigators are expected to continue reviewing open cases involving scientists connected to classified or defense‑related research, focusing on whether any shared vulnerabilities or external threats could place others at risk.
Update 4/20/26 4:48 p.m. ET: This article was updated with additional information.
Update 4/20/26 2:36 p.m. ET: This article was updated with additional information.
Update 4/20/26 1:18 p.m. ET: This article was updated with the X post from the House Oversight Committee.
Update 4/18/26 4:53 p.m. ET: This article was updated with additional information.
Update 4/18/26 3:45 p.m. ET: This article was updated with additional information.