but for karl ryll, there was no turning back. where in the southern philippines dennis would hang out. after a few days of asking questions and passing around her photo, karl found the girl. she was now 20. but was underage, she said, when the relationship with standefer began. and beyond being too young for a relationship with an adult, she said, something happened to her that could land dennis in far deeper trouble. she claimed she had been sexually assaulted by standefer five years earlier. and now, she wanted to press charges against him for rape. karl took her to the local prosecutors office. >> he heard the story. and he said, i'll file charges against this guy for rape. >> reporter: karl had now uncovered something about dennis standefer far more grave than anything he had been pursuing. and he could have dropped out at this point and let police handle it from here. but karl pushed ahead, feeling he had to do this himself, convinced that only he could find standefer. >> and an investor told me that dennis will tell you he's