S4 Ep86: The Box

In 1998, the body of a young boy was found beneath a billboard
along a North Carolina highway. With very little to go on,
authorities were not able to determine who the boy was, or who
killed him. But one investigator was determined to solve the case
no matter how long it took. So he kept the case file in a box
beneath his desk, right in his way, so that he bumped his leg on
it every time he turned in his chair. The box never let him
forget, and he watched and waited for the scientific advancement
that would crack the case wide open. When it finally happened, a
heartbreaking story emerged, leading authorities to a small
Michigan town and another unsolved murder.