telling the truth. a surveillance photo taken that very afternoon, one hour after the attack. fitting the description given by tiffany hartley and what gonzalez is information the mexican sheriff had from the very first day. reporter: sheriff, i ve got to ask you, is that possible that mexico is going to find, catch and adjudicate the killers in what is a lawless part of mexio? i really cannot answer that, but i can tell you that, based on past record, i think they have somewhat of a zero solvency rate and zero conviction rate. reporter: there is one more piece of evidence.