narrator: the wilberger family was informed.nted to know the truth but were almost afraid to discover more about joel courtney and his crimes. i googled him and passed it on to you. you googled him? sure, yeah. what was it like to see his face? you know, i just looked at him, and-- and at that point, it was just a numb feeling, you know? even then, i didn't feel hatred. you know, it was just-- i was all about getting brooke back. i want to know what you did and where she is. narrator: but neither the wilbergers, nor investigators, nor courtney's sister could ever have guessed how they would get the answer to the question, where was brooke? coming up, evidence finally implicates joel courtney in brooke's kidnapping. that's the smoking gun. that's the nail in the coffin. narrator: but will that help bring brooke home? when "dateline" continues. the moment i met him i knew he was my soulmate. "soulmates." soulmate! [giggles] why do you need me? [laughs sarcastically] but then we switched to t-mobile 5g home internet. and now his at