A cluster of disappearances and violent deaths involving scientists, engineers and former military researchers has put communities and investigators on edge. This article walks through the known facts about several cases tied to U.S. defense and space research, detailing who vanished or was killed and what remained behind. Officials are probing links while families and colleagues press for answers as the cases unfold.
Retired Air Force Maj. Gen. William “Neil” McCasland vanished from his Albuquerque home in late February after his wife stepped out for just over an hour. He left his phone behind while his wallet and a .38-caliber revolver were reported missing, according to local authorities. Investigators say he had mentioned experiencing a “mental fog,” but they found no clear sign he was disoriented at the time.
“Arguably, he would still be the most intelligent person in the room,” Albuquerque police Lt. Kyle Wood said March 16 about McCasland. His disappearance is counted among roughly ten recent cases involving scientists and defense-related researchers that have drawn attention at high levels of government. “I hope it’s random, but we’re going to know in the next week and a half,” Trump told reporters Thursday. “I just left a meeting on that subject.”
At McCasland’s house investigators found his phone, prescription glasses and wearable devices, while his hiking boots, wallet and revolver were missing. The timeline shows he was gone from the residence for a narrow window with no confirmed sightings afterward. McCasland retired in 2013 after a career that included leadership at major research sites.
He held senior roles in space research and acquisition, including leadership positions at the Air Force Research Laboratory and the National Reconnaissance Office, and he commanded research sites tied to Kirtland and Wright-Patterson Air Force Bases. His name later surfaced in a 2016 email release in connection with conversations about unidentified aerial phenomena. “Neil does not have any special knowledge about the ET bodies and debris from the Roswell crash stored at Wright-Patt,” his wife, Susan, wrote shortly after his disappearance.
An aerospace engineer named Reza disappeared on a well-traveled trail in the Angeles National Forest while hiking with a friend who was about 30 feet ahead. The friend looked back, saw her smile and wave, then moments later she was gone and a search turned up no trace. Reza led materials work at a major laboratory and co-created a nickel-based alloy used in extreme-heat rocket engines.
In Albuquerque, contractor Garcia was captured on surveillance footage leaving his home on foot carrying a handgun while leaving his phone, wallet, keys and car behind. Garcia worked with a national security campus that builds many sensitive non-nuclear components for the nuclear arsenal and held high-level clearance. Authorities initially warned Garcia “may be a danger to himself,” while acquaintances pushed back against that assessment.
Caltech astrophysicist Grillmair, known for work on exoplanets and contributions to Hubble and Spitzer missions, was shot and killed on his front porch; deputies later arrested a suspect who had been reported for trespassing. Grillmair’s decades of research ran from galactic structure to the search for water on distant worlds. The shooting added a violent element to the string of deaths and disappearances that have raised concern in scientific circles.
MIT physicist Loureiro, director of a major plasma science center and a prominent fusion researcher, was shot at his home and died the following day. Authorities later tied his death to a suspect linked to a separate campus mass shooting, and the suspect died by suicide, closing that particular investigative thread. Officials have not indicated Loureiro’s killing was related to his research.
Longtime JPL engineer Maiwald, 61, died on Independence Day; public records offer only a brief obituary and no autopsy has been reported. Another disappearance involved Casias, a Los Alamos National Laboratory administrative employee last seen walking along a state road in Taos County after leaving work. Family members found her car, purse, keys and both personal and work phones at home, and the phones had been factory reset; “All of her friends keep telling us this is not like her… she wouldn’t leave her daughter,” her sister said.
Retired Los Alamos employee Chavez, 78, was reported missing days after he was last seen at home; his wallet and keys were left inside and his car remained locked in the driveway. Investigators reviewed hours of nearby surveillance but have not identified confirmed footage showing him after he left his residence. In Massachusetts, Novartis scientist Thomas went missing late at night, was later found deceased in a lake months afterward, and officials said no foul play was suspected though the cause and manner of death remain under review.
The overlap in timing and profession among several of these cases has fueled speculation, but investigators have not publicly identified evidence pointing to a coordinated pattern. Each case carries its own facts, ranging from confirmed homicides to unexplained disappearances and otherwise unexplained deaths, and authorities continue to pursue leads as families seek clarity.
