Answer
The single-bullet theory, formulated by Arlen Specter while serving on the Warren Commission, proposed that a single bullet fired from Lee Harvey Oswald's rifle passed through President John F. Kennedy's neck, then Governor John Connally's wrist, thigh, and chest, before embedding in Connally's left thigh. This theory was crucial in establishing Oswald as the sole assassin and rebutting conspiracy theories suggesting multiple shooters.