why would tony kill melissa in the first place? debra villegasa helping you through this difficult time in your life enough for this divorce? >> yes, ma'am. >> and that was the theory, in order to get deborah, he killed her best friend. >> you have these domestic homicides all the time, but this had a twist to it, because he did not kill deborah. >> then tony endeavors 23 year old son, caleb, was called to testify against his father. the usual blank stare on tony's courtroom face changed, as his son recalled how his father blamed melissa for the divorce. >> did he tell you that it was melissa's fault? >> 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. >> 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 believed tony wiped his nose with it after being pepper sprayed. >> the odds of finding an unrelated individual with that profile are rarer than one in 30 billi