Matthew James Sullivan, a former US Air Force intelligence officer, died on May 12, 2024, at the age of 39, just before he was set to testify in a congressional hearing about Unidentified Anomalous Phenomena (UAP), commonly known as UFOs. His death, ruled as a suicide, has raised suspicions among lawmakers, particularly Congressman Eric Burlison from Missouri, who has formally requested the FBI to investigate the circumstances surrounding it. Burlison noted that Sullivan's credentials indicated he was privy to highly classified information regarding non-human spacecraft, raising concerns that he may have been targeted to prevent him from revealing sensitive details. Sullivan had been in contact with fellow whistleblower David Grusch, who expressed distress over Sullivan's sudden death. The investigation into Sullivan's death is part of a broader inquiry into a series of unexplained deaths among scientists associated with sensitive government projects, prompting speculation about potential foul play. Burlison has indicated that witnesses in the ongoing UFO investigations are increasingly fearful for their safety, with some choosing to go public as a protective measure. The case remains under review by local authorities in Virginia, while calls for a comprehensive investigation continue to grow.