gonzalo ramirez.til they stumbled across gonzalo's phone bill where he had written the name patty along with two phone numbers. were eager to find her. mike murri was an orange county deputy district attorney, he did not work this investigation back in 1995 but later joined the case. >> they called this patty? >> faded. >> and where did it lead them? >> they contacted her and she agreed to come down to the police department and discuss gonzalo ramirez. >> reporter: the mysterious patty, it turned out, was then college didn't the tressa esparza. >> we work for the santa ana police department. >> she told the police that gonzalo ramirez was a young man she had met at a club in santa ana, several weeks prior. that they had danced together, she liked him, he seemed to like her. they exchanged phone numbers. >> reporter: that is how her name and numbers came to be scribbled on gonzalo's phone bill that patricia did not seem too concerned about why she was being questioned about gonzalo. >> at what point do