A 12th individual — Jason Thomas, identified as a pharmaceutical researcher — was found dead in March 2026, adding to the expanding cluster of scientists connected to sensitive government programs who have died or vanished. The FBI investigation now covers at minimum 12 individuals. FBI Director Kash Patel confirmed on Fox News: “The FBI is going to be spearheading the effort, collectively with our partners at the Department of Energy and the Department of War. We are going to look for connections on whether there are connections to classified access, access to classified information, and or foreign actors. If there’s any connections that lead to nefarious conduct or conspiracy, this FBI will make the appropriate arrest.” The House Oversight Committee sent formal letters on April 20, 2026 to FBI Director Patel, Defense Secretary Hegseth, Energy Secretary Wright, and NASA Administrator Isaacman — requesting staff-level briefings by April 27, 2026. Critical disclosure: the Department of Defense informed Committee staff on April 16, 2026 that it was “not investigating any missing persons associated with the scientists.” The agency with the most institutional connection to the cluster — through Wright-Patterson, LANL, JPL, and NNSA — claims no investigation is underway.