and one of them, adelbert sanchez, had family members tied to the mexican mafia. >> adelbert had somey members that were incarcerated, they were in federal prison in texas, in florida, they were involved with the sale and transport of large amounts of marijuana from mexico, south texas. >> but detectives could find no connection between the mexican mafia and the murders. and despite investigators' best efforts, the trail of the killers eventually turned cold. >> there was a lot of frustration in this case, wondering, are we going to catch this person? or it's got to be this person right in front of us. >> the families wanted answers. they deserved answers. >> after three years, the families started to believe the case would never be solved. >> your raw instinct is you want to find them yourself. and pulverize them. >> the only real evidence investigators had were the composite drawings. >> it was clear that the people who made this sketch that gave our sketch artist the information, these were going to be great witnesses. >> so rachael's father turned his grief into action. he helped