“I’ve watched cases break in month eight, month 14, month 30,” said Pack, whose FBI career lasted 21 years, 11 of them as a negotiator. “Most every one of those families had stopped believing it was ever coming.”

Anyone with information on the case is asked to dial 1-800-CALL-FBI. An anonymous reward can also be obtained by calling 520-88-CRIME with information that leads to an arrest in the case.