What happened
The aircraft entered an uncontrolled descent before colliding with the terrain. Witnesses on the scene observed the airplane undergo a sudden climb followed by one wing dropping, which led to a spin into the ground. One witness, a pilot-rated individual flying another aircraft, reported observing a multiple turn spin occurring prior to the impact.
Regarding the pilot's condition, the pilot had been treated and released from a hospital emergency room for a thermal injury (sunburn) six days before the accident. Additionally, the pilot had spent a full day canoeing with friends immediately preceding the event, involving further sun exposure.