At about 2135 eastern time, a Cessna 182G crashed while making a visual approach to runway 8 at Butler County Airport. The pilot was killed. The pilot was on an IFR flight plan when he reported accumulating a significant amount of ice He advised the controller he had the airport in sight and he was cleared for the visual approach. The airplane crashed about a half mile from the airport and about 100 feet left of the extended centerline. Ice fragments 2 to 4.5 inches thick were found at the accident scene that matched the leading editors of the wings and tailplane. Initial inspection found no mechanical anomalies.