WILMINGTON, N.C.—The Coast Guard responded to a report of a 52-­year-­old man who was having a heart attack off the coast of North Carolina on Monday afternoon. The man was fishing on the 62-foot sport fishing boat Billfisher approximately 87 miles southeast of Cape Lookout, N.C., when his left side became numb and he began slipping in and out of consciousness. Sector North Carolina watchstanders...