mr. ramirez. testing, led to a stronger conclusion. >> mr. ramirez had been inside that transmission shop. >> so, in 2010, 15 years after the murder, investigator felcher brought the case to prosecutor mike murray, who is known for his work on cold cases. he intern contacted gonzalez brothers. he says they were surprised to hear from him. >> both brothers said that they had figured that with all the years that had gone past since gonzalez'murder, that nobody was paying attention anymore. that he was just another young hispanic man, who had been killed and the police probably were not even investigating the case anymore. >> the confirmation of gonzalez'dna in the shop, was an important step. but the prosecutor knew they needed more. a stronger connection between gonzalo ramirez and his suspected killer gianni van. >> we still needed to establish, how it is that gianni we would have known who it was who allegedly raped patricia esparza. >> was that kind of the missing piece all along? >> to me that