At about 1800 Mountain time, the airplane collided with terrain during cruise flight. The Private pilot and passenger sustained fatal injuries; the airplane was destroyed. Both instrument and visual conditions prevailed along the intended route of flight. The pilot did not file a flight plan. The accident site was on a slope in mountainous terrain, comprised of soft dirt and brush. The wreckage was about 105 nautical miles from Las Vegas on a bearing of 129 degrees, and about 110 nautical miles from Scottsdale on a bearing of 313 degrees.