HISTORY OF FLIGHTOn September 12, 2012, about 1455 central daylight time, a Piper PA-23-250 airplane, N4842P, impacted terrain following an in-flight break-up near Bullard, Texas. The commercial pilot was fatally injured and the airplane was substantially damaged. The airplane was registered to X Aviation LLC, Houston, Texas, and operated by a private individual under the provisions of 14 Code of Federal Regulations Part 91 as a personal flight. Visual meteorological conditions prevailed for the flight. The flight originated from the David Wayne Hooks Memorial Airport (KDWH), Houston, Texas, about 1355, and was en route to the Tyler Pounds Regional Airport (KTYR), Tyler, Texas. According to eyewitness statements, the airplane approached Lake Palestine, near Bullard, while flying several thousand feet above the ground. The airplane was observed to make several turns, pitched nose up, and climbed. The airplane then rolled to the right and headed toward the ground nose first. Several witnesses observed airplane components floating down after the airplane. All witnesses reported hearing loud engine noises throughout the event. PERSONNEL INFORMATIONThe pilot, age 51, held a commercial pilot certificate for airplane single engine land, multi-engine land, and instrument airplane. He was previously issued a flight instructor certificate for airplane single engine which expired on August 31, 1983. On April 5, 2012, the pilot was issued a first class special authorization, interim issuance medical certificate due to hyperthyroidism. A review of the pilot's log book revealed that the pilot had accumulated a total of 937.7 hours, 39.4 hours of multiengine time, and 24.4 hours in the make and model of the accident airplane. He obtained his multiengine land rating on April 28, 2012. AIRCRAFT INFORMATIONThe twin-engine, low wing, six seat, retractable landing gear airplane was manufactured in 1961 with the serial number 27-413. It was powered by two 250-horsepower Lycoming O-540-A1D5 engines driving metal, two-blade, constant speed, Hartzell HC-A2VK-2 propellers. The airplane's last annual inspection was conducted on August 31, 2012, at a total airframe time of 6,076.35 hours. The left engine's starter cable was replaced on the day of the accident. There was no record of any other recent maintenance performed on the airplane. METEOROLOGICAL INFORMATIONAt 1453, an automated weather reporting facility at KTYR reported wind from 130 degrees at 11 knots, 10 miles visibility, few clouds at 5,000 feet, temperature 90 degrees Fahrenheit (F), dew point 64 degrees F, and a barometric pressure of 30.03 inches of mercury. AIRPORT INFORMATIONThe twin-engine, low wing, six seat, retractable landing gear airplane was manufactured in 1961 with the serial number 27-413. It was powered by two 250-horsepower Lycoming O-540-A1D5 engines driving metal, two-blade, constant speed, Hartzell HC-A2VK-2 propellers. The airplane's last annual inspection was conducted on August 31, 2012, at a total airframe time of 6,076.35 hours. The left engine's starter cable was replaced on the day of the accident. There was no record of any other recent maintenance performed on the airplane. WRECKAGE AND IMPACT INFORMATIONThe accident site was located on a road near a wooded, residential area. Damage to trees surrounding the accident site was consistent with a steep descent angle. Airplane components were located in several directions from the accident site at distances up to one-half mile. The largest concentration was within a 40 yard radius of the main wreckage, however wing components were scattered to the north and east of the accident site. Ground impact signatures consisted of two impact craters, one for left engine and one for the fuselage. The main wreckage consisted of the fuselage, empennage, rudder, elevators, both engines, and portions of both wings. The odor of fuel was detected at the accident site. The left wing was fragmented outboard of the left engine. The left flap was found at the accident site along with a portion of the left aileron. The left wing tip was found near a lake shore about 175 yards north of the accident site and the inboard portion of the aileron located about 500 yards north of the accident site. The right wing was fragmented outboard of the right engine. The right flap was found 40 yards east of the accident site along with the right aileron. A large section of the right wing was recovered from a lake about 175 yards north of the accident site, with the right wing tip was located 380 yard east of the accident site. Both engines remained attached to the wing mounts. The left engine was fractured in multiple places. The left propeller fractured at the first crankshaft web. One blade displayed leading edge polishing, deep nicks, gouges, and chordwise scratches. The opposite blade had leading edge polishing and chordwise scratches from the blade root to near mid span where it was displayed aft. The right engine's crankcase was fractured in multiple locations. The right propeller hub remained attached to the engine and one blade had fractured from the hub. Both blades displayed curling, leading edges nicks and gouges, and chordwise scratches. Flight control continuity was established from the flight controls to the rudder and elevators, and to the aileron bellcranks. The cockpit section was fragmented, torn, and displaced. The left engine's tachometer displayed 1,650 rpm with a Hobbs time of 315.4 hours and the right engine's tachometer displayed 1,450 rpm with a Hobbs time of 313.8 hours. Most of the other cockpit instruments were unreadable or destroyed. MEDICAL AND PATHOLOGICAL INFORMATIONAn autopsy was performed on the pilot by Forensic Medical Management Services of Texas as authorized by the Justice of the Peace, Precinct 2, Smith County, Texas. The cause of death was blunt force injuries and the manner of death was ruled an accident. Forensic toxicology was performed on specimens from the pilot by the FAA Bioaeronautical Sciences Research Laboratory, Oklahoma City, Oklahoma. The specimens provided were negative for ethanol and drugs. TESTS AND RESEARCHA layout of the airplane's wings and fuselage was conducted. Both wings displayed near symmetric damage and deformation with signatures that both wings failed in overload with positive wing loading. Examination of the empennage did not reveal any signatures of over travel or flutter.