On March 23, 2015, about 0850 central standard time, a Roy J Picard RV-4 airplane, N945RV, was substantially damaged during a forced landing near Marathon, Texas. The pilot was seriously injured and the passenger suffered minor injuries. The airplane was registered to and operated by the pilot under the provisions of 14 Code of Federal Regulations Part 91 as a personal flight. Day visual meteorological conditions prevailed for the flight, with no flight plan filed. The flight originated from the Los Muertos Airport (6TE2), Marathon, Texas about 0845 and was destined for Tyler Pounds Regional Airport (TYR), Tyler, Texas. During departure climb from 6TE2, the pilot noticed the engine sputter, followed by a total loss of power. The pilot executed a forced landing into a field, impacted a fence and nosed over, which damaged the right wing, vertical stabilizer and fuselage. On scene responders to the accident site reported fuel leaking from both wing tanks. A Federal Aviation Administration inspector examined the engine, fuel system, and cockpit controls and found no evidence of anomalies, mechanical malfunctions, or heat distress that would have precluded normal engine operation. A teardown exam of the engine and fuel system was not performed.