Trying to do so many things at the same time . Tonight he takes us inside the world of spokesperson stardom. One tuck in, and one tuck out. But first, the nightline five. What you doing . Prepping for my bosss party good evening, thank you for joining us. Tonight the stunning revelations about the mother and son on the run and the takedown in mexico. The afluna teen ethan couch, who killed four people drunk driving and his mother. Theyre in custody. They may even have had a party before their escapepe matt gutman has the latest. Reporter the threeweek manhunt for the privileged teen ending with ethan couchs arrest on this gritty street in puerto vallllta, mexico. You see him cuffed and loaded into a police van. This photo confirming 18yearold couch and his mother tanya were detained monday evening. The mother who refused to sit still to be photographed herself, apparently changing her look. The son, dyeing his blonde hair black. The trance formation, so different from the childish looking teen who pled guilty to driving krar. Theres four or fiver kids. Oh, yes, theres another child in the ditch. E on, myy god. In the sentencing, his legal team claimed he suffered from affluenza, too rich and too his sentence, only ten years probation and no jail time. A break for investigators coming on christmas eve, a week after this post was released, offering a 5,000 reward for any information, saying that he was on the run in this black ford truck, belonging to his mother tanya, who was also missing and believed to be withhim. They have probably driven that to the border and crossed over. Reporter adding that before they set out on there 2,200mile trek, they even had something akin to a goingaway party before they left ttn. Reporter mexican authorities were alerted on december 26th and last time they got him. Its like trying to find a officials when the pair arrived in puerto vallarta, they checked into this beachside resort. A tremendous amount of tourists down there, so american pewple were prevalent everywhehe and they wouldldt be somewhere they would stick out. But then they relocated to this shabby Apartment Building on a quiet street. But not many ameririns in this ighborhood where residents said ethan stuck out. Eyewitnesses say they were escorted by police out of that their backs. They said they didnt resist, didnt struggle. Two months ago, we tried to track him down. He wasn probation. Hed never apologized for the deaths. They dont come to woror at rerelar hours. They dont keep regular hours. So its been really hard finding them. But he wasnt looking you he soon surfaced again in this twitter video that went viral. It appears to be couch at this boozy party, possibly violating s prorkz. Ititrompted couch and his mother to flee, ditching his check in with his probation officer. Tonight hes in custody, but the kid who set off an International Manhunt may only get up t t 120 days in jail. Hell be out of prison as soon as he turns 19 in april. The next step for prosesutors is to try to move this case from juvenile courto adult court. So if theres any other kind of violation here, he could be cing serious time behind bars. Reporter it t l started on the night of june 15th, 2013. His bloodalcohol was three times the legal limit when he got behind the wheel of his fathers soupedup, red pickup truck after a night of partying. Gunning it to 70 miles an hour, he lost control of the vehicle there. Bodies scattered hundreds of feet. 15yearold Lucas Mcconnell survived the crash. You were the sound of metal crunching, glass breaking. Screecng. The car that we were in got hit and weot shot across the road. Nailed the tree. The back window was commeel shattered. Lucass father pulled up to the crash scene just moments later. It was chaos. There were people lying around, injured, hurt, dead. People yellingcreaming help me. The teen behind the wheel, ethan couch, walked away from that mangled truck. Once ethan couch was found, the story came together quickly. Not only was he drunk, but there were traces of thc, valal yumm and some other drugs . Right. Which were bad enough on their own, but combine thoseith challenge, just a recipe for disastst. Torney came onto the case just a day after the crash. He charged ethan with everything he could, including fou counts of intoxication manslaughter. He wanted the poor little rich kid to do some bigboy time. We were hoping for and asked for 20 years. But he was tried as a juvenile. During the defense team, his defense team dropped that curious term, a influenza. The judge sentencing him to probation andime in a rehabilitation facility. The couches have settled lawsuits without admitting any wrongdoing but not before depositions were taken in one last case. Ethan couch. For the first time, the boy and his parents at the center of this story were ford to speak. Own, marijuana, cocaine, xanax. I think i tried ecstasy once. Pretty sure that was it. Half the time his parents testifying they allowed their young son a lot of freedom, including driving at the age of 13. You understood if he was at any time he was under 16, he was never to be driving by himself . Yes. Vertheless, you allowed that behavior to happen, correct . Yes. I just kept asking because i wanted to. Eventually they started letting me drive, jpst to like the corner store by myself. Before the deadly crash, ethan was required to complete an alcohol awareness course and eight hours of Community Service within 90 days of a previous incident. We didnt do the Community Service. You understood, did you not, that he was likely to continue the drinking and driving if i should have known that, yes. I really didnt think that was happen again. At one point, ethans parents branded in the media as the worst parents ever. I dont think were profoundly dysfununional. Did you teach ethan that wealth brought privilege . I dont believe that i ever intentionally tried to teach him that. Do you recall ever disciplining ethan f f anythihi . Sometimes i would take Little Things away from him. Or we would just discuss the oblem. When is the last time you recall disciplining ethan for anything . I dont remember. Reporter but now ethan and his mother tanya are both in custody and said to be deported back to the u. S. Within the next 24 hours, to face the consequences. Suspicion that his mother was assisting him and helping him. Which has proven true. Reporter so f authorities haventuncovered any evidence that ethans father is involved, reason to punish the mother. They expect her to be charged with the thirddegree felony o o hindering an apprehension. Amazingly, his mother could face more jail time than him at this point. Because hes in juvenile court. He can only face up to 120 days. Shes facing t t possibibity of up to 2 to 10 years behind bars. Reporter for nightline, im matt gunman, in puerto vallarta, mexico. Next, were going to a Demolition Derby, whehe some of the most aggressive drivers might surprise you. And later, meet the trif ago guy. Whats it like getting funny ad campaign . Open ua lot of dawn. Tough on grease. Yet gentle. Dawn helps open. Something even bigger. Go to facebook. Com, dawn saves wildlife. Fact. Advil pain relieversrsre used by more households than any othth leading brand. To treat their aches and pains more people reach for advil. Relief doesnt get any better than this. Advil. Ive got two reasons to take care of my heart. Thats why i take meta. Meta is clinically`proven to help lower cholesterol. Try meta today. And for a tasty heart healthy snack, try a meta health bar. Come on, wake up come on at time is it . Its go time. Come on. Lets go, lets go, lets go. Woooo hoooo yeah i feel like i went to bed an hour ago. Yeah ill make the cocoa. Get a great offer on the car of your grownup dreams at the mercedesbenz winter event. Its the look on their faces that make it all worthwhile. Hurry, these offers end january 4th. Thank you santa hey amanda, sorry to bother you but i gotta take a sick day. Moms dont take uick days, moms take dayquil severe the nondrowsy, coughing, aching, fever, sore throat, talk about a d dble life. At home the women youre about to meet are moms. But at night, they switch from carpool duty to Demolition Derby, and theyre dead serious about winnnng. Heres abcs david wright catching up again with these crash queens. A rumbling arena, a roaring crowd, and gladiators gunning gasguzzling machines. Competitors ready to destroy each other. This is metal mayhem. 20,000 in prize money at stake. Among those drivers reffing their engines are moms. Some of the toughest women o wheels. Any woman that gets in a dirty car the first time either is hooked or two girls, parttime Little League coach. Are you practicing . Yes. Reporter who, when shes not carpooling the kids, can crash them up with the best of them. Its an adrenaline. Its something different. You dont normally get to go hit people. Reporter shes prepping for her biggest competition so far. Where shell be squaringff against 300 top derby drivers, including her husbsbd, chris. Not the first time thats happened. Reporter building the cars from scratch is a family affair. The kids pitching in. The cars are engineered to do one thing on the road and were doing somethihi different with them to do what you need it to do, to last, thats part of the fun of it. That will get me to the floor. Reporter they strip out anything that can break or burn. Hes cutting the old motor mounts off because they were welded on the ame. Survive crashshg into this. Thats vicki schutte. In 15 years, ive won three features. Reporter a welder by day, a useful trade ih this sport. Her destructive tendencies have paid off. I was the only girl thats ever one my hometown derby, so that was a really big accomplishment for me. Letet start stripping. Ive been doing the Demolition Derby since i was 19 years old. I was born. Reporter her two sons, 14 and 8, already behind the wheel. Do you have a license . [ laughter ] reporter her uncle runs metal mayhem every year. Are you ready reporter Demolition Derby can be a dangerous game. After all, the Main Objective is crashing. Its just whichever car keeps moving forward . The guys hav pretty much stopped the derby. Do injuries happen . They happen. We have a list of rules that we have to build the car to, so theyre looking to see that everything is built properly and that the c i safe. Reporter kims passing with has a problem. The spray foam. I dont know. Youreind of a bad ass, arent yoyo repepter which leads to a frenzy of modifications as fast as possible. I need you to pull out as much foam as you can. Reporr her car is ready. Im hoping not to have a small error take me out. Reporter meanwhile, kim is getting revved up for battle. They may call this the powder puff heat, but theres nothing for vicki, a serious hitch. Exactly what she was worried about. Her drive shaft fails. Her car is a sitting duck. The minute before he said go, i made onene hit and was done. I was devastated. My eyes filled up with tears, because it was a lot of hard work was put intoohat car. Good job reporter kim, muddy but victorious, moves on to the finals. 20,000 for first place. Reporter but theres no time to celebrate. This point right now is the most pressure, its the biggest. Everybody trying to work to get the other and make it back out. Reporter having already survived some serious scrapes, her car has to be fighting fit for the main event. The wiring were trimming and clring, were getting it wonon be pretty, but shell be functional. Reporter and her former rival vicki shows up to help. Vickik helping. She didnt make it and now s ss helping. Reporter the sisterhood kicking in, because that final heat is all men except kim. 50 drivers, a lone woman, against 49 men. Do the men g g after the women . It can be. I mean, were easy targets, apparently we dont know what were doing, so [ laughter ] we likeo prove them wrong,g, thats for sure. Reporter the main event. Come to michigan, girl. Yes, sir. Reporter once they put on those heheets, its tough to tell the men from the woman. Its a free for all. The last, not kims dada she may be back to driving the but already shes thinking about her next metal mayhem. Im david wrightt for nightline in illinois. And next, around the world with the trivago guy. How he literally stumbled into fame. Abc news nightline, brought to you by pfizer. Ry ellen, and i quit smoking with chantix. I have smoked for thirty years and by taking chantix, i was able to quit in three months. 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Reporter lots of people want to know what his deal is. I come from houston, texas, and made my way to new york to study acting. Iorking onn my socalled life with claire danes. Then the sopranos. Reporter but its commercial success that has women and men obsessing over his laidback look that also comes with a little criticism. Tuck in your shirt, you badly dressed trivago guy. Okay, is that enough . Reporter joins the ranks of progressives flow. The most sbrg man in the world. Making career out of advertising one company. He moved to germany. My agents in new york said, are you crazy you dont speak german. I said ill learn it. And then i ended up on a tv show trslated to good times bad i had to shoot on monday and on thursday and friday i had to shoot trivago. And then we realized that okay, none of the belts seem to be fitting the belt loops. So we went t t without the belt. Trivago does the work for you. Reporter a wardrobe malfunction. Put him in the world of the advertising elite. Speaking of celebrity, it was the late american politician in newspaper editor Horace Greely who said fame is a vapor. Riches take wings. Only one t tng endures and thank you for watching