At about 2108 local time, the Mooney was substantially damaged during an ILS Runway 36 approach to the Waterbury-Oxford Airport; the Private pilot was fatally injured. Night IMC prevailed for the flight, which originated in Burlington, Vt. The accident site was about mile from Runway 36 and 1000 feet east of its extended runway centerline. A witness heard a low flying airplane, with the engine running continuously; just prior to the accident, the engine revved to high power and he observed lights over the treetops. He then heard the sound of impact as the airplane came to rest at an adjacent residence. The reported weather included a broken ceiling at 200 feet AGL.