A firefighter responding to the High Plains fire south of Jewel Cave on Wednesday died of an apparent heart attack. Custer County Sheriff Marty Mechaley reported that Dwayne Hudson of the Argyle Fire Department was a passenger in a fire response vehicle and suffered a medical emergency while en route. Hudson was treated by fellow responders and by the Custer Ambulance Service. He was transported to Custer Regional Hospital where he was pronounced dead. The fire, estimated at 100 acres, is located west of Pass Creek Road about seven miles south of Jewel Cave and as of this morning was considered to be 25-percent contained.