dr. sonnier? >> in retrospect, absolutely. >> reporter: for victim joseph sonnier's family, haley's testimony is a asked my dad," i said, "where'd you get this money?" and david shepard says to her, "i did some work for mike. he paid me early. don't ask what i did for him." game over. >> reporter: it takes a new jury only three hours to deliberate. >> and my hand was shaking like this. because i knew we'd got a guilty verdict. i knew it. i knew it. i knew it. >> reporter: and he's right. >> the verdict is in. >> unanimous verdict. >> guilty on two charges. >> reporter: mike dixon is convicted on two counts of capital murder. what was your first reaction? >> i had to turn to my wife and i had to say, "he -- he said guilty, right? he said guilty?" we've been waiting for that moment for over three years. >> reporter: for the sonnier brothers, it's finally closure. >> when you look at the photos of him -- smug smile. when you look at his mug shot from his arrest -- smug smile. and he has had that smile for both trials. and it was so great to be able to know that we finally wiped that smile off his fac

dr. joseph sonnier, is found murdered. a landscaper finds his body. >> oh, no! oh, god. >> reporter: zach johnson, a detective with the lubbock police, heads to the scene. >> this neighborhood had to be freaked out by this killing. >> they were. they were very scared. because this doesn't happen, especially to somebody that's so esteemed. >> reporter: upon entering sonnier's house, it's immediately clear to detective johnson that this isn't a robbery gone bad. there was artwork in the home. there were very expensive pieces of furniture. nothing was taken. it was an in-and-out job. >> reporter: in the dining area, johnson can see where the fatal blows were delivered. >> and that crime scene was very succinct. it wasn't spread out. you had the overturned chair, you had the glass on the floor so you knew that he was shot right here. >> reporter: another clue stands out, a gatorade bottle lies on the floor near the shell casings from the bullets. police determine it's a crudely fashioned silencer. >> we were dealing with something that was a hit, you know, of sorts.

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