At about 1600 eastern time, a Cessna 208B was idling on the ramp when a parachutist was seriously injured by landing on the rotating propeller. The pilot said he stopped after landing and looked for parachutes still in the air. He did not see any and taxied back to the ramp. As he was loading the next group of jumpers, the pilot heard screams and saw a canopy enter the propeller. He shut down the engine and found the injured jumper. The parachutist had completed about 18 prior jumps, including four jumps at that airport. The pilot estimated that the normal parachutist landing zone was between 50 to 300 feet from the ramp area. Winds at the time of the accident were calm.