Rumors have exploded online after a string of deaths and disappearances involving people tied to U.S. nuclear, aerospace, and defense institutions. Names linked to places like Los Alamos National Laboratory and NASA’s Jet Propulsion Laboratory fueled speculation fast.

Then came remarks from President Trump, who suggested the matter deserved scrutiny.

“I just left a meeting on that subject, so pretty serious stuff,” Mr. Trump told reporters Thursday. “Hopefully, coincidence… but some of them were very important people, and we are going to look at it.”

Yet despite the viral theories, officials and experts close to the cases say they have found no evidence of a sinister campaign targeting American scientists or government staff.

Separate Cases, Shared Headlines

The 10 cases drawing public attention stretch across three years and involve different states, agencies, and circumstances. Some were disappearances. Others were confirmed homicides or deaths linked to personal struggles.

Those reviewing the incidents say the pattern may look dramatic online, but reality appears far more fragmented.

A well-placed government source said the FBI was not treating the deaths and disappearances as part of a suspicious coordinated pattern. Instead, the Department of Energy, which oversees facilities including NASA’s Jet Propulsion Laboratory and Los Alamos National Laboratory, is examining concerns.

FBI spokesman Ben Williamson called it a “developing situation.”

“The FBI is aware and providing all assistance requested,” he said. “Usually what happens is we are not the lead in cases like this unless local authorities request.”

Meanwhile, the National Nuclear Security Administration said it is monitoring the issue.

“NNSA is aware of reports related to employees of our labs, plants, and sites and is looking into the matter,” a spokesperson for NNSA told CBS News.

Experts Say Context Matters

Current and former Energy Department officials acknowledged the optics are striking. Still, they cautioned against jumping to spy-thriller conclusions.

“People do just die. Strokes, heard disease, suicide, mugging, it happens,” the former DOE official said.

The same source stressed that large national labs employ thousands of people, many in support or administrative roles with no access to classified secrets.

“If you attach ‘nuclear weapons facility’ and some sketchy sounding job title, it could conceal how mundane someone’s job may be,” the former DOE official said.

Joseph Rodgers of the Center for Strategic and International Studies said the cases lack a clear operational connection.

“The deaths and missing persons cases are scattered across several years at different and only loosely affiliated organizations,” said Joseph Rodgers, the deputy director of the Project on Nuclear Issues at the Center for Strategic and International Studies. “If all of the scientists were working on one project or weapons system, then I’d be more suspicious.”

Scott Roecker, vice president for nuclear materials security at the Nuclear Threat Initiative, said some public fears may be shaped by overseas assassinations of Iranian scientists.

“If you were looking at a foreign adversary, Iran might come to mind because of the Iranian nuclear scientists who have been assassinated,” Roecker said.

“But we’re not like Iran. We have thousands of scientists. We have a robust infrastructure. So there would be nothing strategic Iran could achieve by taking out 10 or 20 of our nuclear scientists, as tragic as the individual deaths might be,” Roecker said.

New Mexico Cases Drive Much Of The Speculation

Retired Major General William Neil McCasland, 68, vanished from his Albuquerque-area home in February. He reportedly left without his phone, wearable devices, or prescription glasses. Authorities said he had hiking boots, his wallet, and a .38-caliber revolver.

Search crews used drones and K9 teams, but little has surfaced beyond a gray U.S. Air Force sweatshirt found more than a mile from his home.

His past military leadership roles, combined with online UFO chatter, pushed the case into conspiracy territory. His wife firmly rejected that narrative.

It “seems quite unlikely that he was taken to extract very dated secrets from him.”

She also mocked claims tying the disappearance to hidden extraterrestrial files.

“Neil does not have any special knowledge about the ET bodies and debris from the Roswell crash stored at Wright-Patt,” she wrote in jest in the Facebook post, referring to conspiracy theories about aliens being found in the desert.

“Though at this point with absolutely no sign of him, maybe the best hypothesis is that aliens beamed him up to the mothership. However, no sightings of a mothership hovering above the Sandia Mountains have been reported,” she wrote.

Local officials said investigators have not uncovered evidence of foul play.

“Investigators have so far uncovered no evidence of foul play,” according to an official in Bernalillo County, which includes the Albuquerque metro area. The official added that the investigation is ongoing.

Authorities are also searching for Steven Garcia, 48, who disappeared last August and reportedly worked as a property custodian for the National Nuclear Security Administration’s Kansas City National Security Campus in Albuquerque.

Farther north, two former or current Los Alamos-linked workers are also missing.

Melissa Casias, 53, was last seen walking alone on a highway with a backpack, according to relatives who reviewed surveillance footage.

“Melissa was an administrative assistant and did not have high-level clearance,” said her niece, Jazmin McMillen.

“I’m happy to see Melissa’s case getting attention but I haven’t seen any evidence linking her to any of the other cases,” said McMillen, who organized family search parties and has reviewed multiple pages of police documents related to the case.

Anthony Chavez, 78, another former Los Alamos employee, disappeared in May last year.

California Hiker Vanishes

Another heavily discussed case centers on Monica Jacinton Reza, a 60-year-old aerospace engineer who worked on rocket engines.

She disappeared on June 22, 2025, while hiking in Los Angeles County. Volunteers later organized search efforts across rugged terrain.

Murders And Confirmed Deaths Had Personal Circumstances

Several deaths often grouped into the online theories already have documented explanations.

MIT professor Nuno Lureiro, a specialist in fusion and plasma physics, was fatally shot in the Boston area last December. Investigators said the gunman was Claudio Neves Valente, a former classmate motivated by jealousy.

Astrophysicist Carl Grillmair was shot dead on his porch in Los Angeles County in February. A 29-year-old suspect has been charged.

Researcher Jason Thomas was found in a Massachusetts lake last month after being missing for three months. His wife previously said he had been distraught after both of his parents died last year.

NASA’s Frank Maiwald died on July 4, 2024, at age 61 in Los Angeles.

Michael David Hicks, a physicist with NASA’s Jet Propulsion Laboratory, died in July 2023 at age 59.

What We Actually Know

Despite the dramatic headlines and relentless social media theories, investigators and analysts say there is still no verified evidence tying these cases together.

What remains is a series of tragedies, mysteries, and unrelated criminal acts that became one larger internet narrative.