joe sonnier, mike didn't like it one bit. the two buddies tossed around some bizarre schemes to try to break up richelle and joe. >> david tells dr. dixon, "you know, if you really wanna get to sonnier, you know what you need to do? you need to order him some gay porn magazine. and you gotta send it to his >> that would destroy him. >> it's -- >> yes. it's -- >> and it's immature. >> it's immature. >> so they -- did they do it or no? >> no, they don't do that. dr. dixon, nah, man -- nah, i don't want to do that. >> another scheme dave concocted to embarrass dr. sonier involved hiring a women he knew from a gentleman's club, named sheena teague. >> he has a proposal for you. >> he said that his friend, dr. dixon, had been dating a woman, and that she was now dating a doctor in lubbock, and he wanted me to call the ex- girlfriend and lie to her, saying that i was having sex with her boyfriend as well, for money. >> sheena said no. but according to dave, mike wasn't giving up. he sent dave to lubbock repeatedly to spy on richelle and joe. >> so they're in full-on stalking mode. >> yes, stalking. committed. we're -- we're gonna do th

dr. joe sonnier. for the sonnier family, it was time to put on a game face. >> i decided before the second trial that we should be confident as a family and support the d.a. and really push this thing forward. >> pushing it forward was exactly what prosecutor matt powell had in mind. that meant the prosecution would not put dave shepard on the stand this time, although the jury would hear about his confession. >> it's a largely circumstantial case. did you feel like it might be a tough sell that this prominent doctor who seemed to have everything would want to kill a total stranger? >> i didn't think it was gonna be a tough sell at all. i think the evidence was very strong that he was an active, willing participant in this. >> prosecutors had discovered hundreds of text messages between dave and mike. both men deleted their texts after the murder, but forensic experts were able to retrieve about half of them. >> there were a series of urgent texts between shepard and dixon in middle of june. "gotta ha