The executive director of the New Jersey State Commission of Investigation was killed in an early-morning crash in Mercer County Wednesday that police say was caused by another driver running a red light. A spokesperson for the agency, an independent watchdog commonly referred to as the SCI, confirmed that Chadd W. Lackey, 55, of Voorhees, died in a crash in Hamilton. “We are devastated by the tragic news of Chadd’s death,” SCI Chair Tiffany Williams Brewer said in a statement released Wednesday afternoon. “On behalf of my fellow Commissioners and the entire SCI staff, we extend our prayers an…