The airplane impacted terrain at approximately 0145 Central time while flying an ILS approach. The commercial pilot was fatally injured and the flight instructor and pilot-rated passenger were both seriously injured. Instrument conditions prevailed for the flight, which was being operated on an IFR flight plan.
According to an initial statement from the surviving pilot-rated passenger, the flight was uneventful until the airplane descended on the ILS. The passenger reported that the airplane then entered a fog bank. During the approach, the student saw the airport lighting system to the left of the airplane, which began a left turn before it impacted the terrain. At 0153, an automated weather observation included ¾ miles visibility with mist and 200 feet vertical visibility.