An anonymous donor has upped the reward to find the person responsible for the deaths of Abigail Williams and Libby German, whose bodies were found on the Delphi Historic Trail four years ago. Indiana State Police announced Monday an anonymous donor chipped in $100,000 toward the Delphi Investigation reward fund, bringing the total to $325,000. The reward is reserved for anyone who provides information leading to the arrest and conviction of the person behind the deaths of Williams, 13, and German, 14. The girls’ slayings have remained a mystery since their bodies were found near the Monon High Bridge on Valentine's Day 2017. The girls went for a walk in the woods the day before, but never arrived at their pre-arranged pick-up spot.