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Of pepper spray, too. there were two shoes found in the car, but nothing else. melissa had been wearing a sterling silver ring, diamond earrings and a $5,000 watch. she also had an expensive prada handbag and an iphone. could very well be a target of some opportunistic grab and run. >> at the point we find her vehicle, we have no clues, no leads, and we don't have any suspects identified. >> reporter: police did find a tiny drop of melissa's blood in her car and on a tile in her house. but there were no fingerprints other than melissa's in either place. dna testing would take longer. now the q...

Years in prison. but one big question emerged, speculation about that woman in the firm who'd been killed. >> whether melissa knew about the ponzi scheme is one of those great mysteries. >> reporter: scott had started his ponzi scheme three years before melissa was murdered. >> is it time to take a fresh look at the whole melissa lewis murder? is there something more sinister? >> reporter: detective brian kendall now had a whole new problem with his fairly straightforward case against tony, the jealous train engineer. is this woman, melissa, killed because she knew too much? >> after we think ...

Before the defense rested, the judge asked tony villegas if he wanted to testify. >> is it your wish to testify or remain silent? >> silent, sir. >> reporter: in closing arguments, prosecutor tate said all the evidence pointed to tony. the pepper spray, cell phone records, and the dna. >> there is not one other person on the planet earth that could leave the dna on this jacket. >> reporter: the defense reminded jurors that the pepper spray evidence was weak, and that both phone records and dna results could be manipulated. >> the pieces of the puzzle do not fall into place, because reasonable ...

Signal was lost. either the battery died or the killer dumped the phone. all told by thursday, the day after the murder, the phone or whoever had it travelled a distance of about 60 miles. >> so obviously, who's with that cell phone, was most likely the last person that was with -- with melissa. >> reporter: detectives also focused on those five hours the phone was stationary in miami gardens. was the killer home in bed? >> we have to identify if melissa knows somebody that lives in this area. >> reporter: does anything come up at that point? >> no. we have no reason to believe anybody she's d...

>> did he tell you that it was melissa's fault? >> he -- he believed that she had a part in it. yes. >> did he tell you that he was mad at melissa about this? >> yeah. he was mad about the whole situation. >> reporter: oh, and there was one more thing. remember melissa's jacket, the one found in her suv? tests showed tony's dna on the jacket. prosecutors believe tony wiped his nose with it after being pepper sprayed. >> odds of finding an unrelated individual with that profile are rarer than one in 30 billion. >> reporter: you couldn't have had better evidence if you had a movie of him killing...