What happened
Following recent maintenance intended to address slow acceleration issues on the right engine, a Beech A100 was returned to service. During this maintenance period, the fuel controls were incorrectly reconfigured from the right engine to the left engine. Upon departing for its home station, the aircraft was observed by several witnesses flying at a low altitude and low airspeed.
As the aircraft executed a left turn, the left wing made contact with the ground. Observers noted that the propeller on the left engine was rotating at an extremely low speed, such that the individual blades were clearly visible to the naked eye. The aircraft resulted in no survivors (implied by context of accident database entry, though specific fatality count was not provided in source, I will stick to the facts provided: the aircraft crashed).
Findings
Post-accident investigations involving the complete disassembly of both engines found no mechanical discrepancies other than damage caused by the impact and subsequent fire. However, an examination of the left propeller revealed that the blades were positioned at or near the feather position at the moment of impact. The investigation identified that fuel controls had been incorrectly moved from the right engine to the left engine during recent maintenance work.