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America’s foremost criminal profiler is now giving his insight into the mystery of who killed two Delphi, Indiana, teens. Abby Williams and Libby German were found dead after they went for a hike in February 2017. More than two years later, authorities have yet to catch their killer. Among the few clues is video from Libby’s cellphone showing a man walking toward the two girls and a recording in which a man apparently says “guys down the hill.”