I imagine both share some responsibility in the accident. Perhaps the skydiver didn't land where he was supposed to, but:
a) shouldn't the pilot have been notified there were people skydiving in the area and taken extra precautions?
b) surely the pilot should have seen the skydiver while approaching the runway/grass strip/field/whatever and pulled up? He didn't exactly come out of nowhere or was difficult to see.
(I am neither a skydiver nor a pilot and have no idea if either of these are reasonable expectations)