A series of deaths and disappearances involving U.S. scientists has raised concerns about a possible pattern, though no evidence confirms a connection.

Retired General William Neil McCasland and NASA engineer Monica Jacinto Reza both vanished while hiking in the Southwest, while three other scientists were recently killed or found dead.

Some speculation links their advanced research—ranging from fusion energy to aerospace technology—to conspiracy theories about UFOs, but these claims remain unproven.

Congressman Tim Burchett has called for greater attention, citing national security concerns and criticizing intelligence agencies, the Daily Mail has reported.

Authorities continue to investigate the cases individually, with no confirmed evidence tying them together.