HISTORY OF FLIGHTOn October 11, 2015, at an undetermined time, an experimental Woodstock I glider, N21468, impacted terrain near the Decatur Municipal Airport (KLUD), Decatur, Texas. The pilot was fatally injured and the glider was substantially damaged. The glider was registered to 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, which operated without a flight plan. The local flight originated from KLUD about 1430. According to a member of a local glider flying club, the pilot was towed by an airplane about 1430. Another member of the club saw the glider maneuvering between 3,000 and 4,000 feet mean sea level several miles from the airport between 1430 and 1500. At sunset, the pilot was unaccounted for and the flying club reported the glider missing. The wreckage of the glider was found about 2030 near the approach end of runway 17. There were no known witnesses to the accident. PERSONNEL INFORMATIONThe pilot, age 70, held a private pilot certificate with a glider rating and a commercial pilot certificate with airplane single engine land, airplane single engine sea, airplane multi-engine land, and instrument airplane ratings. He also held a flight instructor certificate for airplane single engine and instrument airplane which expired May 31, 1992. On May 6, 2008, he received a second class special issuance medical certificate. On his application for the medical certificate, he reported 1,030 hours of total time with 0 hours logged in the preceding six months. His log books were not recovered during the course of the investigation, and the pilot's current total time is not known. AIRCRAFT INFORMATIONThe glider, was an single-seat, amateur built Maupin Woodstock I glider built in 1999. It operated under a special airworthiness certificate as an amateur built aircraft. The pilot purchased the glider in July 2005. The glider's log books were not recovered during the course of the investigation and the glider's history could not be determined. METEOROLOGICAL INFORMATIONA review of metrological information found that a wind primarily out of the south from when the glider departed until civil twilight. An automated weather reporting facility at the airport reported the following wind: Local time, wind direction, wind velocity 1535, 210°, 13 knots (kts) gusting to 21 kts. 1615, 180°, 14 kts gusting to 18 kts. 1635, 180°, 14 kts gusting to 20 kts. 1655, 190°, 12 kts gusting to 18 kts. 1715, 200°, 13 kts gusting to 17 kts. 1735, 190°, 12 kts gusting to 18 kts. 1755, 190°, 12 kts. 1816, 200°, 9 kts. 1855, 180°, 8 kts. 1915, 170°, 6 kts. 1935, 160°, 7 kts. Civil twilight began at 1926 and the glider was not equipped with lighting required for night operations. AIRPORT INFORMATIONThe glider, was an single-seat, amateur built Maupin Woodstock I glider built in 1999. It operated under a special airworthiness certificate as an amateur built aircraft. The pilot purchased the glider in July 2005. The glider's log books were not recovered during the course of the investigation and the glider's history could not be determined. WRECKAGE AND IMPACT INFORMATIONInspectors from the Federal Aviation Administration (FAA) Flight Standards District Office responded to the accident site. The main wreckage consisted of the entire glider with only one impact crater which the wreckage rested upon. It came to rest facing a northerly heading. The nose and belly portions of the fuselage were shattered. Both wing leadings edges showed minor damage. A wingtip counterweight was found at least 50 ft from the accident site. The elevator trim was set to an unmeasured nose up position. An examination of the glider did not find any preimpact anomalies with the glider that would have precluded normal operations. COMMUNICATIONSThe tow pilot told the FAA inspectors that the pilot did not have a radio on-board his glider during the tow. MEDICAL AND PATHOLOGICAL INFORMATIONAn autopsy was performed on the pilot by the Southwestern Institute of Forensic Sciences, Dallas, Texas, as authorized by the Justice of the Peace, Precinct 2, Wise Country, Texas. The cause of death was as a result of blunt force injuries. 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. Tests were negative for carbon monoxide and ethanol. The following substances were detected: Atorvastatin detected in Liver Atorvastatin detected in Blood (Cavity) Metoprolol detected in Liver Metoprolol detected in Blood (Femoral) Atorvastatin is a prescription medication used to reduce high cholesterol and triglyceride levels. It reduces the risk of chest pain, stroke, heart attack, or certain heart and blood vessel problems. Metoprolol is a prescription medication used alone or in combination with other medications to treat high blood pressure. It also is used to prevent angina (chest pain) and to improve survival after a heart attack. Metoprolol is also used in combination with other medications to treat heart failure. The pilot reported to the FAA the use of both atorvastatin and metoprolol. He received a special issuance second class medical that had since expired. To pilot a glider, a valid medical certificate is not required.