billy lee. >> why did you choose to focus on mr. lee? just too many discrepancies. >> reporter: remember, billy was cleared, had a solid alibi. but now the defense was using sanchez to raise doubt about who the real killer was. >> there's a lot of smoke here but no fire. >> mudles it up. >> and that, i believe, was the defense strategy, that if you have enough of that, then the jury won't see through it. >> reporter: the jury retired to consider. >> oh, i was so nervous, i just paced up and down the halls, in and out. >> reporter: four hours later, they were called back into court. >> has the jury reached a verdict? >> we have, your honor. >> the defendant shall please rise. we find the defendant, bradley farrington, guilty of first-degree murder. >> reporter: when they announced their verdict? >> there was a lot of tears, a lot of sighs of relief. one of the deputy attorneys says, thank you for not giving up, thank you for pushing. and i said, how could i? it was my little girl. >> reporter: brad farrington was sentenced to life. no par