narrator: dixon talked about the women in his life, like richelle shetina. shepard even met her. ut it didn't last. when shepard told detectives, when richelle took up with another man, another doctor named joe sonnier, dixon didn't like it one bit. the two buddies tossed around some bizarre schemes to try and break up richelle and joe. zach johnson: david tells dr. dixon, if you really want to get to sonnier, you know what you need to do? you need to order him some gay porn magazine, and you've got to send it to his office. so did they do it or not? no, they don't do that. dr. dixon is like, nah, man, that's-- that's not-- i don't want to do that. it was a very-- narrator: another scheme they concocted to embarrass dr. sonnier involved hiring a woman shepard knew from a gentleman's club, named sheena teague. detectives spoke to her. so did we. 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, say that i was having sex with her boyfriend,

richelle shetina. zach johnson: ok. ng: so the detective took a closer look at richelle's story. remember, the night before his body was found, she said joe was supposed to call her at home, but never did, and he never answered her texts. zach johnson: in my mind, this is the love of her life. she's very distraught, yet she calls him, and it's very uncharacteristic for him not to answer the phone. but we don't go to the house, we don't call anybody to go and check on him. to me, that was a little bit suspicious ow to me, that was a these people are involved. andrea canning: and when johnson spoke to the famy, he learned the rela marriage. was he open to marriage? again? missy bartlett: i don't think that he was looking for that. he was finding himself free to-- to explore the world, explore women. was richelle content with just, you know, being boyfriend and girlfriend. and just enjoying life? based on what joe told us repeatedly and how stressed out he was, no. she was putting the clamps on him to get married. andrea ca