>> she was very forthcoming. she was willing to give us a statement, willing to allow a search of her apartment, willing to allow us a search of her vehicle. >> michael's sister stephanie provided the first solid lead. she said michael complained about a man he saw around the apartment complex. >> the guy would just talk to him but the guy made him uncomfortable for some reason. he didn't say why. the guy never said anything suspicious to him or anything mean, but he said he always felt a little uncomfortable or a little uneasy around the guy just because his character seemed little bit off. >> unfortunately, michael never identified the man, provided a physical description or mentioned where in the complex he lived. >> right at that point, investigators had merely the crime, the crime scene, and a very large universe of potential suspects with not a whole lot to go on pinpointing a specific person. >> with no other suspects for the murder of michael andrade, investigators appeal to the public for help. four days later, an anonymous tipster called. >> the crimestoppers tip was amazing in its detail. >> the tipster told police the killer didn't enter andrade's