Louis Shack, 46, left his Pine Bluff, Arkansas home between 4:00 and 4:15 a.m. on July 1, 1999, heading to his job in nearby Rison. He was married and a father, dressed that morning in blue jeans and a black and white t-shirt. At about 4:45 a.m. the Arkansas State Police found his vehicle abandoned on the Free Bridge in Pine Bluff; the engine was still running but Louis was not in or around the car.

The Pine Bluff Police Department investigated, but the scene on the bridge produced few clues and no witnesses have come forward with information that explains his disappearance. Over time the investigation yielded no significant leads and the case grew cold, leaving his family without answers.

If anyone saw Louis or his vehicle on the Free Bridge or along his route that morning, does that information still exist that could help explain what happened?