them. >> reporter: shepard's daughters murderer. >> and do you think that mike dr. sonnier? >> yes. >> yes. >> reporter: but on the stand a shocking twist nobody saw coming. >> shepard himself has basically denied all of his previous testimony. >> reporter: shepard's confession was expected to put mike dixon away. this is what he said. >> i said, well, just go behind him when he's not paying attention, hit him with a board. i said, you could probably kill him. and doc went -- like that. we'll talk about that later. >> reporter: but in the courtroom he suddenly changes his story and says mike dixon letting his friend completely off the hook. >> you begin to question him. what happens? >> well, he completely digressed from what his statement was to law enforcement in the fact that mike dixon didn't have any involvement in this deal. >> reporter: the veteran prosecutor blindsided. >> what's going through your mind? >> okay, game on. >> in that moment i've never hated anyone more than i've hated him in my entire life. >> reporter: the shepard daughters also watching are embarrass

he's a plastic surgeon in amarillo. >> reporter: dr. 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. >> what attracted you to him? >> he was funny, he was very witty, and he was enjoyable. 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? 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 to amarillo for a face-to-fac

dr. sonnier. mike dixon never wanted that to happen. >> i asked him, you sur you i said, when you kill somebody, that will affect you for the rest of your life. you'll have nightmares. it will bother you. and he goes, "doesn't bother me." >> reporter: and when it was time for the trigger man to testify against his best buddy in open court, the sonnier family was sitting front and center. >> he had a chance to get up there, confirm his story, point to that guy as the person who paid him to kill my dad, and end it all. >> reporter: he does end it. bubu not in the way dallas wants. shepard is about to drop a bombshell. >> but daddy, why didn't you tell that? >> reporter: and make his own flesh and blood despise him. >> you've made yourself a monster, dad. >> reporter: when we come back. i'm jerry bell the second. and i'm jerry bell the third. i'm like a big bear and he's my little cub. this little guy is non-stop. he's always hanging out with his friends. you've got to be prepared to sit at the edge of yo

one-time best friend dr. mike dixon are now serving life in prison without the possibility of parole. dixon's lawyers are appealing that verdict. >> and that is our program for tonight. but be sure to join us tomorrow night for a special "20/20" saturday. i'll have the very latest on the major new turn in the bill cosby case. i'm elizabeth vargas. >> and i'm david muir. for all of us here at "20/20" and abc news, thank you for watching tonight. and i'll see you tomorrow night. >> that's right. >> good night. >> anchor: new at 11, robbed, two victims targeted at restauras. >> anchor: up in flames, the fire shooting from the window of the home. several pets trapped inside. >> anchor: officer under fire. chilling video of a man shooting 13 times into a police car.

i'm dr. mike dixon. >> 911, what's your emergency? >> reporter: three people trapped in what would become a dance of death. >> there's a bullet. i need somebody to hurry. >> there are police cars everywhere. there's crime scene tape all around. it was just absolute chaos. >> it was an in and out job, a hit to kill this person specifically. >> reporter: tonight only on "20/20," the woman caught in the middle between two doctors. >> the kind of plot you expect from a soap opera. >> this is the oldest story in the book. this is vengeance. this is revenge. this is pride. >> reporter: a dangerous game of cat and mouse. >> accused of hiring a hit man -- >> so there was some kind of a triangle things going on. >> reporter: but who's the cat? >> no part of this is right. >> reporter: who's the mouse? >> this is a huge whodunit. >> reporter: a case with no shortage of suspects. a list of ex-girlfriends. a peeping tom in the back yard. and a con man with his own obsession. >> i'm kind of a sassy smart [ bleep ] an

<dr. mike brown cal tech- 2539 it's pretty exciting to know be found"> two scientist at cal tech say they have discovered a ninth planet in system. professor mike brown and assistant professor konstantin batygin(bah- tee-guin) say after nearly two years of research -- they have evidence a giant planet is orbiting billions of miles beyond neptune and has a mass ten times the size of earth. these researchers say for the last have been found by other astronomers and all of these objects swing in the same direction.

question for dr. mike.mpact to children, the new virus will have if they happen to get bit by an infected mosquito? >> remember this virus is not really something that causes lots of problems, unless you're pregnant. now, any kind of virus, if you're a young person or you're an elderly person, you might have more severe symptoms. but when it comes to the zika virus, you have a rash, you feel terrible and it goes away. the rub is if you're pregnant because it increases the risk of microcephaly which is a problem. >> let's get to our next question. we have another one that came in by twitter. this is lisa, i have lupus what are my risks? >> well, as long as you are not pregnant, the only thing to be concerned about is patients that have lupus sometimes take medications to reduce their immune system's response. so you might get a more severe case of it. but if you're not going to get pregnant or if you're not pregnant, go have fun. >> one more came in and let's take a look at this question. you talked about it

. >> hello, i'm dr. mike. >> what's the emergency. >> reporter: three people trapped in what would become a dance of death. >> there's a bullet. >> i need somebody to hurry. >> reporter: one of those people joseph sanjay, a well known doctor, successful businessman, and multi millionaire. >> he's living the single life, having a fun time. >> reporter: so it wasn't about getting married? >> i don't think he would have gotten married again. >> at 19, sanjay married his high school sweetheart becky, but the marriage fell apart. so the doctor went back out on the dating scene. >> he went on a lark to a dance class, ballroom and salsa and swing. and through that dance community, he found his >> reporter: and that's where he finds her. rachel shateena. >> she's blonde, she's tall, she's gorgeous. >> reporter: they have a lot in common. both divorced, both with grown children. their first date, a football game with his kids. >> reporter: it's the first date and he's bringing you around his family. >> it really wasn'

mike and he paid me early. was a prepayment for killing dr. sonar? >> in retrospect, absolutely. >> reporter: it takes a new jury only three hours to deliberate. >> the verdict is in. >> unanimous verdict. >> guilty on two charges. >> reporter: mike dixon is convicted on two counts of capital murder. he's appealing the verdict. as for the woman at the center of it all, rashel shateena has a warning. >> there are real sociopaths and psychopaths that walk amongst us. they're charming. they sit at the dinner table with you and your children, and sometimes they sleep in your bed with you. >> reporter: tonight, rashel shateena has put mike dixon out of her mind, but says joseph sonar will always have a place in her heart. >> i'll always love him. i'm just -- tell him how sorry i am. >> reporter: for "nightline," i'm ryan smith in lubbock, texas. >> dixon's lawyers still and that their client never ordered the hit on dr. sonler. and they are appealing the verdict. >>> up next, from "magic mike" to lip sync battles, channing tatum took the stage and beyonce

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. lubbock police department. >> his first thing was, oh, my, i don't know anything about him. >> i haven't talked to her in months and 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 whodunnit. until a witness comes forward with a name, dave shepherd,

please welcome with me, dr. mike murdock. >> i was sitting there at your house with ya and you said, "mike, what's one of the greatest turning points of your life?" i'd have to tell you, july 13, 1994. it was a wednesday morning, at seven o'clock. it was the day i fell in love with the only person capable of understanding me. there is nobody i began to write love songs to him. there is nobody like you there is nobody there's nobody like you sweet holy spirit sweet holy spirit there is nobody there's nobody like you he purifies like fire. there is nobody... there's nobody like you there is nobody there's nobody there's nobody like you he's the only person you are required to obey. sweet holy spirit sweet holy spirit there is nobody there's nobody like you i've written almost 6,000 songs.

i don't know, dr. mike, it seems like common sense, especially if you're single or a mom who is trying to raise children on her own, and you know that you're not making as much as your counter counterparts, that's depressing. we've known, amy force decades that women suffer from depression and anxiety more than men and we've looked at all kinds of possibilities. could it be child rearing? but this new data looking at over 22,000 workers indicates that if you're doing the same job as your male counterpart and you're getting paid less, you have a dramatically increased risk of depression and anxiety, and it's not just if you're at the lower end of the economic scale, amy. these are executives as well, tn can have significant long-term health affects. >> so what do managers need to know about the study, what should she hear? >> it's a no-brainer, if someone does a job, whether you're a man or a woman, whatever, there should be no bias, no gender, no racial gap whatsoever. and if you do that and everyone is on

us live with more this morning.or good morning dr. mike. d m how are you?ev it's right here. >> it's about time. >> well we're usually worriedally wor about what's inside the box, but now we're worried about the box. why? because the fda is saying, say hey, some of the chemicals thatha they use they're called pfs' that prevent the grease from dripping through the box on your boxn y lap as you bring it home can actually be problematic with regards to birth defects and defts a certain kinds of cancers like le kidney cancer.an get rid of them.of that's what they're saying.'re >> is this the kind of thing cheind mike, though, where it'ss moderation? you know where you wou have to have like a pizza a day day for two years for this to havehis to an impact or is it a greater gre risk than that? >> well i'm a believer that if you look at the environment in toto the entire expose toe to things like biz phenol al foreplays text all thief things can add to problems down thehe road. and we need to eliminate thete the ones that we can. now the manufacturers of these the

. >> john: and pose a potential health risk and dr. mike joins us live this morning and let's talk about the dangers here. i don't know if it is -- i'm like, okay. here we go again. for us, john. right here. all right, normally you and i talk about things like eating all of the pizza in the box. and then getting big but what we are talking about is the box here. and what the fda is doing is they are saying, hey, there are certain chemicals called pfc's, per per per-florinated chemicals and these chemicals have been a associated with birth defects and cancers like kidney cancer and the fda said enough is enough. forget it, no more. >> john: they'll be cracking down. but, i mean, doc this will sound weird. you are a doctor, a scientist but also a dad and guy. is this one of those stories -- i -- remember the receipts a few years ago, and we knew it was up your receipt -- is it one of those stories or more serious. >> it is another thing, there ing chemicals and do you need a biohazard suit to pick up pizza, no. and everything in moderation bu

dr mike has more than one million instagram followers and is using that social media fame for good with this auction. the prospective dates must donate to his charity for a chance to win. winners will fly to new york city and stay at a 4-star hotel then the lucky lady and mike will dine at a michelin star restaurant. the raffle ends jan. 27. doctor mike is indeed single. mcdonald's is turning french fries into a dessert item... but you have to go to japan to taste the fries chocolate. mcdonald's japan adding the "mc- its menu. are drizzled with white chocolate sauce. says the combination creates what it calls "a wonderfully salty and sweet harmonious taste." the "mc-choco available for a japan starting january 26th. choco potatoes? i facebook friends and.... more coming up on we're back in 2 and stay with us "announcer: now with fox19 news. from email alerts for breaking news and weather. it's all right here in the palm of your hand." we continue to all: milk! milk! milk! milk! milk! okay! fun's over. aw. aw. thirsty? they said it would make me cool. they don't sound cool to me. guess n

>> stephen: we'll be right dr. mike novacek.rawfortslikestyl ked justtle dow , arm so) donn thcellar door pick ts rere luot. plus up to $300 to spend at sea. come seek the royal caribbean. offer ends february 15th. is tis n? ah. tooto b.non. cled we ownt,we it. let'dot. eah. lly, something that's not too good to be true. it's oscar mayer natural turkey breast, and it tastes great. we brought you here today to get your honest opinion about this new car. to keep things unbiased, we removed all the logos. feels like a bmw. reminds me a little bit of like an audi. so, this car supports apple carplay. siri, open maps. she gets me. wow. it also has teen driver technology. it even mutes the radio until the seat belts are buckled. i'm very curious what it is. this is the 2016 chevy malibu. and it sells for? it starts at twenty-two five. what? oh wow. i mean with all this technology. etk hena ilaesplel andt fongou a jik er>> lphll teuw p.opeorobldalat 'stydipl se oh hrhe ttd.osi?h, i ar b sbe tuanour s ikdoad t no >> ac de, othu

joining us is special guest dr mike brown. dr brown is a professor of planetary astronomy. he made many significant scientific discoveries, he's probably best known as the man who killed pluto. welcome to "techknow" dr brown, why did you do it? >> the obvious answer is did it have it coming. if it wasn't me someone else would do it. >> tell me the story. >> pluto never should have been called a planet. it was a mistake, just because everyone thought it was big when it was discovered, as big as june it ter and realised it was smaller and smaller. it is smaller than our moon. and there are thousands of other things out there just like it. >>> if pluto is not a planet, what is it? >> the official definition is work planet. which i like to think about things that look like planets. >> i love the story of the declassification of pluto. it's a great example of how new information can change the idea that a group of scientists have about something they take for time. >>> you came up with an announcement about pluto, did you face much feedback? >> i had hate mail for many years, fr

p>> dr. mike says it's not just pthe size of his salary that pattracts women, he says resident clinton being a doctor ptakes dedication drive and pcompassion and why women would plove to date doctors. p>> yes. pi mean that's sounds about pright. pother top industry that is women pfind attractive if you're pcurious, guys. pfinance, law, entrepreneurs and pmarketing professional all of pthese take a big commitment and pthe survey think that women pbelief a man can be committed to phis career he can certainly pcommit to a relationship. p>> makes sense. pyes. papp also asked men the career pthe top 5, sounds pretty similar pto guys. pentrepreneur, fashion, pconsulting, marketing and then pat number 5 is doctor. p>>> you know i'm just sad to phear that report angst or pjournalist, isn't on the list. eople know what's up i guess. p>> i'm a little biassed i think pnews photographer are pretty psexy gig. pi think that makes sense for pvanessa to say. pshe's engaged to our hotographer. roblems in rio the g

here's dr. mikea new study contrary to popular belief, american teeth are actually worse than british teeth. the data now shows that we as americans are missing more teeth than the british. now, we also tend to have a greater disparity between dental health and those who have money and those who don't. this is greater here than it is in the uk. if you have bad teeth, you need to be aware that this can have negative impacts on your heart. it has to be to do with inflammation and the more inflammation you have the more likely you are to have problems with your heart and overall health. >> oh, behave, dr. mike. your advice on brushing and flossing is definitely something to smile about. even if the study is a little silly. >>> looking out at trenton, new jersey, the gold dome over the capitol building they say where trenton make the world takes. it doesn't look that bad. looks sunny. looks okay. mike tells us it's going get cold. >> yeah. i mean it's not bad. this morning certainly cold. but it's going

dr. mikes. >> i'm sorry, i can't really hear you because i have two kids at home and my little daughter amy lee just screams into my head and i feel my bones rattling. kids can reach 110 decibels if they're screaming in a shrill high pitched voice when they're crying you can damage your hearing. >> sorry to hear that, dr. mike. silly scientists who put together this research may be on to something. ♪ >> all right. so a pet is stolen from store i sounds like a joke starting off. >> pet stolen from a store in oregon people are talking about the way that the thief tried to steal that pet. >> it's a dumb criminal catego category. a guy you knew it was a man goes in there you can see what we're showing you he takes a snake. where he put the snake. >> super crowded recently but they can clear out. so many people make those new year's resolutions and they can't keep up with it. coming up there are four things, four signs that will tell you you're not going to make your 2016 new year's resolution. >>