Jason Andrew Knapp was a 20-year-old Clemson University sophomore studying mechanical engineering when he disappeared in April 1998. On Saturday, April 11, 1998, he spoke with his mother and later watched a movie at his Calhoun Street apartment; his roommates left him alone at about 10:30 p.m. and that was the last known sighting. He was wearing a t-shirt, blue jeans, and blue sneakers.

His roommates reported him missing on April 17 after he failed to make his usual daily call. On April 21 his white 1990 Chevrolet Beretta was found locked and abandoned in a rugged area of Table Rock State Park, about 30 miles from campus. Inside were untouched takeout bags, a six-pack of root beer and a bottle of orange juice; a park pass bought on Easter Sunday bore his fingerprints and is the only confirmed evidence placing him at the park. He had withdrawn $20 the day he vanished and there has been no account activity since.

More than 3,400 hours of searching across the park — including cadaver dogs, helicopters and divers — turned up no sign of him. He was not an experienced hiker, did not own camping gear and his bicycle was not with him, making his presence in the difficult terrain unexplained. If anyone knew Jason or saw him in Clemson or at Table Rock that weekend, can you share what you remember?