Former FBI Agent Makes Bombshell Claims on ‘Suspicious’ Disappearances of U.S. Scientists

The Federal Bureau of Investigation (FBI) and the Congress recently announced they will be investigating the mysterious disappearances and deaths of top U.S. scientists believed to possess sensitive information about nuclear, defense, and space projects.

Around a dozen scientists have either been found dead or have gone missing under suspicious circumstances in recent years. An expert has warned that these individuals may have been targeted due to the sensitive nature of the projects they were involved in.

“The missing [and] disappearance thing is suspicious inherently. What they were working on would certainly, without a doubt, be a target of a hostile foreign intelligence service like Russia or China. It could be Iran, could be Pakistan,” Chris Swecker, a retired FBI assistant director, said in a statement to Fox News.

Talking about the possible motive behind such disappearances, Swecker highlighted that foreign agencies seek to acquire advanced U.S. technology because they are unable to develop it on their own.

“There is a daily collection effort by China, Russia, Iran, to some extent, North Korea, but mainly China and Russia, to steal technology because they're not good at [research and development]. And their whole programs depend on stealing the technology and reverse engineering it,” Swecker added.

The former FBI official concluded his statement by alerting those involved in defense and research companies to the risks associated with the work.

“So, scientists, people involved in the defense contracting companies, research and development at universities, you know, all types of technologies in the U.S., even if it's not military use, ought to be aware that this type of stuff goes on day in and day out,” he said.

Authorities became alarmed about the frequent disappearances of scientists after William Neil McCasland, a retired Air Force Major General and former commander of the Air Force Research Laboratory, went missing on February 27, 2026. He went for a walk in New Mexico without his personal belongings, but never returned home.

McCasland reportedly had access to classified information on aerospace and defense, prompting the government to launch an investigation. The case also brought similar disappearances into the spotlight. In June 2025, Monica Jacinto Reza, an advanced-materials researcher at NASA’s Jet Propulsion Laboratory, went missing while hiking.

Similarly, Melissa Casias, an administrative professional at a nuclear research lab, disappeared in late 2024. The FBI and Congress are also investigating the deaths of scientists like Nuno Loureiro, a researcher at the MIT Plasma Science and Fusion Center, who was mysteriously found dead last year.

Earlier in 2023, planetary scientist Michael David Hicks, who worked on the asteroid deflection mission, passed away due to ‘undisclosed’ conditions. Initiating a probe into the deaths and disappearances, House Committee on Oversight and Reform Chairman James Comer said it may all be part of a ‘sinister’ plot.

“It does appear that there’s a high possibility that something sinister is taking place here. 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,” the Kentucky Rep. stated.