On September 7, 2020, about 1247 central daylight time, a Beech G35 airplane, N4636D, was substantially damaged when it was involved in an accident near Canyon Lake, Texas. The pilot and one passenger were seriously injured. A second passenger received minor injuries. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. The pilot reported that while enroute to the Canyon Lake Airport (34TS) the engine lost all power shortly after he switched the fuel selector to the left main fuel tank in preparation for landing. The pilot attempted a forced landing to a clearing but struck trees on the edge of the clearing and the airplane impacted the ground. The airplane incurred substantial damage to its fuselage and both wings. Postaccident examination of the airplane’s engine and fuel system did not reveal a reason for the reported loss of engine power.