LAGRANGE, Ga.—An Auburn University student disappeared after leaving his job at a Georgia bar one night in January 1976, and authorities long believed he was murdered. But the only person ever convicted went to prison for years for making false statements about a killing that may never have happened. Nearly a half-century after the disappearance, the open hatch of a 1974 Pinto became visible in the murky water of an Alabama creek. It was Kyle Clinkscales’ car, and the Georgia Bureau of Investigation will now analyze about 50 bones found inside, including part of a skull, a Georgia sheriff said. “We may never know” how the 22-year-old died, Sheriff James Woodruff of Troup County said at a news conference after the car was pulled from the creek on Tuesday near Cusseta, Alabama. He said Clinkscales could have accidentally run off the road, about three miles off the interstate between his …