mike dixon's door. dr. mike dixon's door. >> dr. dixon? i'm detective johnson with the lubbock police department. >> reporter: but why wouldn't he have shared all that with police who were then coming by his house? he didn't even mention your name. >> my speculation is that he didn't know what to do and he's like, okay. "let's not bring dave in 'cause then we're like throwing dave under the bus." plus it looks bad for him. i was trying to get pictures about this guy that was dating his former girlfriend. i didn't mean to kill dr. sonnier. i have nothing against dr. sonnier or his family, or richelle shetina. i have nothing against any of them. i really don't. >> reporter: what would you say to them right now if they were watching? >> i'd tell them that i'm very sorry. i took your loved one. >> reporter: despite shepard's second story, the prosecutor is undeterred. and a year after the mistrial, mike dixon faces a retrial. >> amarillo doctor michael dixon is back on trial -- >> reporter: and this time around, matt powell has a new witness.
. >> reporter: dr. mike dixon. i'm dr. mike dixon. surgery -- >> reporter: well known, he's divorced, wealthy, and used to date richelle. >> he had a place in amarillo injections. >> what attracted you to him? >> he was funny, he was very witty, and he was enjoyable. if it can be enjoyable to have somebody put needles in your face, you know, i guess that's be. >> reporter: richelle and dr. dixon had dated for a year and a half before they broke up and she started seeing dr. sonnier. >> did he know about your current relationship? >> he knew that i was dating joseph. he called him by name in a series of text messages, trying to get me to go out with him and to meet him for coffee. >> reporter: richelle says she rejected his advances but he was persistent. >> so he wanted you to see him on the side, basically? >> he wanted me to come back to him. i told him no. kind of man to take no for an answer? johnson wants to find out. so he drives two hours to amarillo for a face-to-face conversation with richelle's ex that the detect
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