Several prominent scientists and researchers in the U.S. have reportedly died or gone missing over the past year, fueling speculation about whether some of the disappearances may have occurred under suspicious circumstances.

William Neil McCasland, a 68-year-old retired Air Force major general who had knowledge of UFOs, went missing in New Mexico on Feb. 27, NewsNation reported. Republican Tennessee Rep. Tim Burchett told the Daily Mail on Sunday that he believes there may be a pattern emerging of other researchers throughout the nation similarly disappearing "under suspicious circumstances."