FBI, Congress Probe Possible Links in 10 Cases of Missing or Deceased Scientists from Nuclear and Space Labs

By Chas Newkey-Burden, The Week UK

*Published: 2026-04-24*

The FBI is examining potential connections among 10 cases of missing persons or deaths involving scientists and staff associated with U.S. nuclear and space technology laboratories, according to agency statements. The Republican-led House Oversight Committee has also initiated an inquiry, sending letters on April 20, 2026, to FBI Director Kash Patel, the Department of Energy, NASA, and the Department of Defense, requesting briefings on any national security implications.

Four of the cases originated in New Mexico. Retired U.S. Air Force General William Neil McCasland, now director of technology at an aerospace defense firm, disappeared from his home in Albuquerque on February 27, 2026. Two Los Alamos National Laboratory employees, Christopher Chavez and Joseph Casias, went missing in 2025. A fourth case involves J. Loureiro, also linked to the region. Officials have not identified evidence linking these or the other six cases beyond geographic proximity in some instances and professional similarities.

The House Oversight Committee cited public speculation in its letters as a factor prompting the review, according to committee statements. The FBI confirmed it is leading efforts to assess any connections among the cases. In a post on X, NASA stated it is cooperating with investigators but noted that "at this time, nothing related to NASA indicates a national security threat."

Social media discussions have included theories of coordinated foul play or foreign espionage, as reported by CBS News and The Hill. However, family members and experts have questioned such links. McCasland's wife wrote on Facebook that extracting "very dated secrets" from her husband, who retired from the Air Force more than 12 years ago, appears unlikely.

Julia Hicks, daughter of Michael David Hicks, a scientist at NASA's Jet Propulsion Laboratory who died in 2023, told CNN there is "no train of logic" connecting her father's death to the other cases. "I can’t help but laugh about it, but at the same time, it’s getting serious," she said.

Joseph Rodgers, a researcher at the Center for Strategic and International Studies, noted that the cases span several years and involve organizations with only loose affiliations. "If all of the scientists were working on one project or weapons system, then I’d be more suspicious," he said.

An anonymous former U.S. Department of Energy official remarked, "People do just die." Sources familiar with the investigations, cited by CBS News, described the incidents as potentially stemming from "something more personal and tragic" rather than organized espionage.

The cases under review are scattered across multiple years and locations, with no confirmed ties reported by investigators as of April 24, 2026. The FBI's role focuses on determining if patterns exist, while the congressional probe seeks details on any threats to sensitive research programs.

Public interest has grown amid online discussions, but official statements emphasize ongoing fact-finding without conclusions. NASA reiterated its cooperation, and the Department of Energy has acknowledged the committee's requests without further comment.

The House Oversight Committee's action follows reports of the New Mexico cluster, which drew initial attention. No arrests or suspects have been named in connection with the disappearances or deaths.

Investigators continue to review circumstances, including professional backgrounds in nuclear physics, astrophysics, aerospace engineering, and related fields at facilities like Los Alamos and NASA's Jet Propulsion Laboratory. Preliminary assessments have not substantiated espionage claims, according to available statements.

As the inquiries proceed, federal agencies and lawmakers aim to clarify any overlaps. The FBI has not released a timeline for findings, and the Oversight Committee plans hearings pending responses to its letters.

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