charlie tan had a bright future. t then charlie's father was killed in the tan home and everything was changed. police were being told one story, but the evidence was telling them another. here is dennis murphy with "house of secrets." >> cayuga. that's cayuga lake in ithaca, new york. where you'll find one of the most prestigious universities in the nation. cornell, the ivy league. big red. more than 13,000 undergrads here working towards degrees will with good fortune take their places in medicine, the law, the arts. there's no doubt a cornell education can be a gold-plated entrance to adult life. and only the best need apply, students like charlie tan. he was so kind, his classmate featured him in a video, random acts of kindness. giving gifts to complete strangers. >> not just a great kid but the greatest of great kids. >> reporter: charlie was the son of chinese immigrants who became "mr. everything." scholar, class president, the guy with the cool friends, hannah valentine opened up her parents' summerhouse to c

. >> charlie, do federal prosecutors and from your understanding of this piece you just wrote, does he have -- does he have a point? >> what andrew nepal tandescribing was the classic crime of conspiracy, when two or more people agree to commit some other crime and take minor step toward that, that that point they already committed the crime of conspiracy, even if they never fulfill their plan to carry out some other crime, like you and i agree to rob a bank and look at the bank to look at the security around it and never rob the bank, we've -- we're already guilty of that crime of conspiracy. that's what andrew is getting at when he was saying that it doesn't matter if no information was received because the crime of conspiracy at that point would already have been completed. >> or if you break into the bank and there's month money there, that could be something along those lines as well. and i would point to don jr. and that e-mail exchange with rob goldstone where he says that a woman from the russian government has dirt on hillary clinton. don jr.'s response in black and white in writing, was if it's what you say it is, i love it. jona