Jason Knapp
Jason Knapp (SUBMITTED)

Tuesday marked the 13th anniversary of the disappearance of Jason Knapp.

Knapp, a 1996 graduate of Central York High School, mysteriously disappeared April 12, 1998, while attending Clemson University in South Carolina.

Authorities searched the mountains of Table Rock State Park, where his car was found, but they did not find any clues.

"Basically, there hasn't been anything new," Knapp's father, John, said Tuesday evening.

John Knapp said he sent flowers to be placed at a cannon on the campus.

His mother, Deborah Boogher, is in South Carolina and visited the park Wednesday. Officials have not stopped looking for Jason over the years.

"Jason is not forgotten down here at all," she said.