The airplane was destroyed and the Commercial pilot and passenger fatally injured at 1114 Eastern time on impact with terrain while atempting to land at a private turf field. Instrument conditions prevailed. While receiving vectors in an attempt to locate the VFR-only airport, the pilot stated, actually the field is directly under me if I could, ah, spiral down. The controller then cleared the flight for a visual approach. No further communication was recorded. Weather recorded at a nearby airport included calm winds, two statute miles visibility in mist, a broken cloud layer at 500 feet, and a broken cloud layer at 800 feet.