Authorities have issued a tragic update in the case of a national park volunteer who went missing last week. The National Park Service (NPS) announced in a press release that Great Smoky Mountains Park volunteer Amy Houghton, 73, was found dead on Feb. 2. Houghton disappeared between Jan. 28 and Jan. 29 after departing for a hike in North Carolina’s iconic park; she was reported missing on Feb. 1 after her car was found at the Smokemont Campground. Local authorities and rescu...