. >> his name andnd dr. michael dixon. >> hello, i'm dr. mike dixon. >> reporter: well known, he's divorced and wealthy. rashel and dr. dixon dated for a year and a half before she broke up. >> he knew thafes dating jason. he called him by name in a series of text messages. he wanted me to come back to him. i told him no. >> reporter: but is dixon the 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 rashel's ex, that detective johnson secretly records. >> dr. dixon, i'm with the lubbococ police department. >> his first thing was, oh, my, >> i haven't talked to her in monthshsnd months. >> okay, well, that's a little accounted, because she told us that he knew about the relationship. >> i'll be honest with you, i love, love, loved that woman. >> for detective johnson, alarm bells bells were sounding. >> reporter: dixon seems like a likely suspect, but he has an alibi the night of sonar's murder. >> there's something not right here, this is a huge whodunni
mike dixon. >> hello. i'm dr. mike dixon. if you're considering plastic surgery -- >> reporter: well known, he's divorced, wealthy, and used to date richelle. >> he had a place in amarillo and i went there to get botox injections. >> 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 about as enjoyable as it could 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. >> reporter: but is dixon the kind of man to take no for an answer? johnson wants to find out. so he drives two hours
dr. joseph sonnier stunned everyone including his girlfriend richelle shetina. authorities found he was an innocent victim of a disturbing scheme in a case of jealousy and obsession spinning out of control. >> i was in shock. >> reporter: she was an unwitting part of a bizarre love triangle. >> evil followed me straight to joseph's door. >> reporter: and this morning richelle shetina girlfriend of wealthy prominent texas doctor dr. joseph sonnier found stabbed and shot to death in his upscale lubbock home is speaking exclusively to abc. about the man convicted in his killing. her ex-boyfriend. dr. michael dixon. >> there was an ugliness from him to me. >> reporter: it's a tale of jealousy, obsession and revenge. dixon prosecutors say was in love with shetina, desperate to split up her relationship and hired his friend ex-con dave shepard to kill sonnier. it's a claim dixon's lawyers vigorously deny. >> mike dixon never wanted that to happen. >> reporter: days afterwards shepard confesses.
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