“NCIS” killed off Rocky Carroll’s Director Leon Vance during its milestone 500th episode Tuesday night, leaving fans of the CBS hit absolutely reeling. “NCIS” dropped a bombshell Tuesday night — and this time, it wasn’t the explosive kind. Warning: Spoilers ahead. In one of its most brutal twists ever, the long-running CBS hit action drama killed off Rocky Carroll’s Director Leon Vance during its mi... [3017 chars]