The National Park Service said in a news release that the body of Gregory L. Miller, 65, of Durham washed up on the north end of South Core Banks yesterday. Miller was staying at the Great Island Cabin Camp, which is operated by the park service on Cape Lookout National Seashore, the news release said. Authorities have not said how Miller died. National Park Service rangers and the Carteret County Sheriff’s Office have begun an investigation, according to the news release.