are out. >> it was the next morning that they found her. >> i could see two girls laying there. it was horrifying. there was duct tape on their mouths, on their hands. >> a mystifying scene. >> the only thing we have are cigarette butts and suspicion. >> dna would point one way. >> he's like, sarge, you've got to take a look at this. >> a bombshell message would point to the other. >> i read the letter and knew this was important. >> a twisted trail leading to a sinister suspect. >> takes a special kind of mind that wants to do something like that. >> to crack a case this convoluted it might just take a miracle. >> that was extraordinary. >> i just couldn't believe it. welcome to "dateline." two young women were discovered in a park bound and gagged, both were sexually assaulted and shot