Kate says she's convinced somebody out there knows something. "At the end of the day, this man is known to somebody, you know? He's someone's son, someone's brother, someone's cousin, someone's neighbor, someone's colleague," she says. "Even if these people don't know that he definitely did it, they might have a suspicion. And if you know somebody really well, you don't want to think that he could be linked to something like this. ... It's just reaching out to them and saying, 'Please come forward.'"