The Beech King Air E-90 was observed to break out of the clouds in a steep descent, land long, and run off the departure end of the 4637 ft runway. The aircraft received substantial damage and the crew of 2 and 6 passengers received minor injuries. The touchdown point was estimated by several witnesses to be approximately 3400 ft from the approach end, leaving 1200 ft of runway to stop the aircraft. There was no record of any landing clearance issued by the control tower and no record of the pilot reporting the final approach fix inbound to the control tower as instructed. The visibility minimums for the non-precision localizer approach are 1 mile. The minimum descent altitude for the approach was 492 ft above the airport elevation. The last weather that the pilot was issued was indefinite ceiling 100 ft sky obscured, visibility 3/4 mile with rain and fog. A special weather observation after the accident showed the only change to the weather was an increase in visibility to 1 mile.