The Trump administration removed Alvin Brown a little more than a year after he was sworn in for a term that was expected to end in 2026. The White House didn’t say why he was removed and Brown has not publicly commented.

The decision comes as NTSB investigates nearly 1,250 active cases across the U.S., while supporting more than 160 foreign investigations, according to March testimony by NTSB Chairwoman Jennifer Homendy.

The investigations include the deadly midair collision between a passenger jet and Army helicopter in Washington, D.C., that killed 67 people in January and the medical transport plane that plummeted into a Philadelphia neighborhood that same month, killing eight people. It’s also investigating the catastrophic collapse of Baltimore’s Francis Scott Key Bridge in March 2024, which killed six construction workers.