All those little girls, theyre so little. The secret relationship that could have driven him over the edge. Nightline will be right back. Dand steaks arent just for dinner. St. And right now we can have both for less because with choice sirloin. Dennys is elevating its new steak and eggs for just 10. 99. Its new and its a pretty big deal. See you at dennys good evening. And thanks so much for joining us. Tonight, in his own words. A colorado man admitting to murdering his wife and daughters. Now his inlaws are speaking out on the family they thought was happy and the man they thought they could trust. Heres amy robach. Reporter body camera videos. Are you chris . Reporter evidence of a hidden affair. Interrogation tapes. Unraveling the intricate web of lives that made up chris watts secret life, offering clues as to why he murdered his pregnant wife shanann and his two daughters. Shananns devastated parents speaking out for the First Time Since their daughters murder. I told the police to find his gps, because his gps is going to tell them where my family is. Reporter from the outside, the watts family seems perfect. In social media videos, chris mays the pa plays the part of a who having husband and doting father to his two daughters. My daddy is a hero. Hey, guys were here from the boat today. Reporter shanann is a social media maven and master of the digital stage. I am so excited. Im driving with you. She was fun, full of life. She did so many things. She had her hand in everything. . Love you guys, have a great day. Reporter just about every moment of shananns leave streams live other facebook. Chris and i are sitting here waiting to board our flight to miami. Were going to toronto in june. Reporter if you were on the outside looking in she seemed to have the perfect life. S she did. Reporter did you believe she was happy . We did. Reporter chris works for an oil company. Shanann loved sharing their love story which started not spreesingly on facebook. I got a friend request from chris on facebook. One thing led to another, and hes the best thing that has ever happened to me. Say hi, cici. Hi, daddy. Reporter how was chris as a father as far as you could see . He was a very loving father. As far as i know, he loved his family. Reporter and then last june, another baby is on the way. I know. Boy, boy. Chris wants a boy. I hope its a boy for him. It will make him happy. Reporter as luck would have it, its a boy. She had a name for him already . Yeah. Reporter she works for a multilevel vitamin company. Her best friend and coworker, Nicole Atkinson remembers dropping her off at home after a work trip the morning of august 13th. And i believe it was around 1 45 in the morning you dropped her off . Roughly, yeah. Reporter what was the last thing you said to her . . I just told her, if you need help in the morning, let mow know. I gave her a hug and watched her go in the house. Reporter that morning, Shanann Watts goes offline. She didnt text me, because she texts me every morning. Reporter nicole decides to try her in person. She knows the code to the front door. What happened when you got to the house . I couldnt get in. It was locked from the inside. And then i called chris and asked if he knew where shanann was, and he said she went on a playdate. And i said chris, her cars in the garage. How could she go on a playdate . Reporter she becomes concerned and calls the police. My names nicole, and im calling because im concerned about a friend of mine. Shes not answering the door. Shes not responding to Text Messages and phone calls. Reporter as nicole impatiently waits for the cops, shananns husband, chris watts, whos at work calls her friend Cassie Rosenberg to see whats going on. He called me, and i was screaming at him. I was frantic. You need to get to the house. Nikkis calling the police so we can break down the door. And he said no, dont call the police. I dont want to get them involved. I said youre an idiot and you need to get to the house because somethings wrong. Reporter Frederick Police officer, scott kuhnrod races to the house. Are you nicole . Reporter this is footage captured on his body camera. Im going to check the back to see if i can see anything. Reporter after a quick check of the perimeter, chris watts finally shows up. Scott, how you doin . This is the only vehicle she would have . She would drive . Reporter the officer then asks to search the home. Mind if i holook around . Reporter the basement, bedroom, bathroom. The only signs of life . The barking dog. Chris tells police he saw his wife early that morning before he left for work. Last i talked to her was this morning. She said she was going to take the kids to a friends house. And then i texted her today, i neverr the house appears neat and orderly, nothing out of place or rummaged through. We all ran through the house kind of looking for her. We checked upstairs. Shes not there. And it was odd the things that you did see. It didnt make sense to me. Reporter shananns purse and wallet on the counter. Wedding ring on the nightstand and unmade beds. Does she normally make the bed, the kids beds . Reporter and their beds would have definitely been made . Yes. Reporter and her sheets wouldnt have been stripped off the bed . No. There was a sheet missing from the bed in the master bedroom. Oh, that wasnt on there . The matching sheet, the nonfitted or flat sheet was found in the garbage can. Reporter eventually, they find her cell phone. Does she work . Yeah, she works from home. Reporter and in the kitchen. Your kids take any medication . Cici takes singulair. Reporter the biggest clue of all, medicines, including little cicis epi pen. My daughter would never leave the house without her phone or the epipens. Definitely an odd one. Reporter police get a break in the form of the watts next door neighbor. He has a security camera. The only thing i caught was chris backing his truck into the garage. Reporter chris comes over to your home along with the police to watch that surveillance footage. Yes, he was standing right in my living room, basically watching it. And he looked very frantic. He had his hands like this in the air, on his shoulders. And he was really swaying back and forth. Reporter was he saying anything . No, he wasnt saying anything. He basically, the only time i saw him show any emotion was a little bit of nervousness when he was watching that tape. My detective just showed up. You want to talk to him . Im going to get his input real quick. No. Reporter seemingly desperate to find his family, watts turns to the media for help. Shanann, bella, celeste, if youre out there, just come back. Like, if somebody has her, just please bring her back. I need to see everybody. Reporter did he sound worried . No, he didnt give a flying flip. I said chris, you know, i dont think you should do any media. I said, youre the last one to have seen them. So i dont think you should. Reporter and yet he did. I thank god he did it. I thank god in heaven that he didnt listen to me. Reporter in that interview, chris admits he and shanann had exchanged words before she disappeared. It wasnt like an argument. We had an emotional conversation. Ill leave it at that. Reporter in the weeks before shanann went missing she expressed great concern that her marriage was falling ap paapart. If you are done, dont love me, dont want to work this out, not happy anymore and only staying because of kids, i need you to tell me. . Im not just staying because of the kids, they are my life, and that will not change. Im not sure whats in my head. She just told me that chris said he wasnt happy anymore and that she didnt know what was wrong. Reporter shanann texting another friend. Chris told me last night hes scared to death about this third baby and hes happy with just bella and celeste and doesnt want another baby. He has changed. I dont know who he is. Did she ever suspect another woman . I think she entertained the idea because she did get, i dont know if she checked the bank account but got an alert on the phone. Reporter a dinner raises her suspicions. Turns out, she was right. Chris was having an affair with a young, pretty brunette named Nicole Kessen jer. She says he told her they were separated and getting a divorce. I thought what we had, it was very comfortable for me. I enjoyed it. I think he did very much as well. Reporter these are photos released by authorities of their time together. He didnt have a wedding ring on his finger. He didnt even mention his kids right away either, and one day he told me he had two kids. I thought it was kind of cute, i was like, oh, hes a dad. Reporter all these photos, including nude pictures of nicole would end up in a secret app camouflaged as a calculator in chriss phone. My daughter had no clue. She was clueless. Reporter when we come back, Nicole Kessingers stunning revelation that not only is his wife missing but 15 weeks pregnant. If can you lie to me about this, what else can you lie to me about . Oh oh ozempic® announcer people with type 2 diabetes are excited about the potential of onceweekly ozempic®. In a study with ozempic®, a majority of adults lowered their blood sugar and reached an a1c of less than 7 and maintained it. Oh under 7 . announcer and you may lose weight. In the same oneyear study, adults lost on average up to 12 pounds. 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Open one today and see what unfolds. man vo do not use qbrexza if you have certain medical conditions. Qbrexza may cause new or worsening urinary retention, problems with control of your body temperature and blurred vision. The most common side effect reported was dry mouth. Call your Healthcare Provider if you experience side effects. woman vo imagine how life can unfold. Ask a dermatologist how you may reduce excessive underarm sweating with qbrexza. Nightline continues. Here again, amy robach. Reporter as Police Conduct their investigation into the disappearance of Shanann Watts and her two little daughters. Her husband chris agrees to take a polygraph exam. Did you physically cause shananns disappearance . No. Are you lying about the last time you saw shanann . No. Do you know where shanann is now . No. Reporter chris fails the test. It was completely clear that you were not honest during the testing. I think you know that. You did not pass the polygraph test. I didnt lie to you on that polygraph, i promise. Reporter he doesnt admit to a crime. Instead, chris watts confesses to an affair. I cheated on her. I feel horrible about it. Reporter he refuses to name his mistress. Who is her . I dont want to get her involved in this. Shes a wonderful person. I saw her, took my breath away. And i never thought in a million years that could happen. Well leave her out of it. Okay. Get back to your wife and your daughters, where are they . They were at the house when i left. They were there. They werent there. They didnt leave. They vanished. The only way they could have left is in your truck. Reporter eventually, watts asks to speak with his father, ronnie watts, who has just flown in from north its a stunning statement. Chris watts claims shanann had attacked the kids and he killed her in a fit of rage. Cbi agents reenter the room. Theyre not buying chris story. I think were very, very close to the truth but were not there yet. Im not a monster. I didnt kill my babies. Reporter honing in on where the bodies are. Whereabouts is shanann and the girls . Can you mark it for the s for shanann . Reporter watts marks the spots with their initials. The two girls in separate oil tanks. Their pregnant mother, shanann, in a shallow grave nearby. The missing bed sheet also found on the scene. Sickening, isnt it . Reporter how do you row act to that . Devastated. He is a monster. How do you put someone you love into an oil tank . Especially your children. Reporter the investigators recover the bodies. The little girls autopsies contradict their dads version of events. They werent strangled, they were smothered. His statement that he had seen shanann strangle the girls. I knew in my heart of hearts that the friend i cared so much for would never hurt her babies. I knew from day one that that was not true. Reporter chris mistress, Nicole Kessinger breaks down, thinking about what he did to his two daughters. He is so disgusting. Im so ashamed of him and everything. And i just, oh, those little girls. Theyre so little. Theyre so why . Why . Why . W why . Why . How . I dont understand how you could bring yourself to do that, to somebody whos hilike that big. Reporter chris isdand agree exchange for no death penalty. At his sentencing hearing he must listen to shananns mother, sandra. We loved you like a son. We trusted you. I didnt want death for you, because thats not my right. Your life is between you and god now. And i pray that he has mercy for you. Reporter through his attorney, watts issues a short apology. Mr. Watts has asked us to share this morning that he is devastated by all of this, and although he understands that words are hollow at this point, he is sincerely sorry for all of this prison without the possibility of parole. A few months later n a miss interview, watts admits for the first time that he killed his two young daughters. He describes driving them alive next to their dead mothers body out to that oil field. Some of the details are hard to hear. I got shanann out, pull her over to the side there. And then the girls, right . Cici first. Where exactly was she . In the back seat. There was a blanket. And once shes gone, did you pull cici out . . I pulled cici out. She went into the tank and bellas still in the truck alive. Put that blanket over her, too and did the same thing. She said no, daddy. And thats the last thing she said. Reporter how do you want your daughter to be remembered . Hodo you want the world to remember her and your granddaughters . She was an amazing daughter. Bell a wanted lipstick today. She wanted to soar the earth. She said mama, i want to leave my mark on the earth, and she did. Reporter sandras unshakeable faith gives her the strength to keep alive the happy memories of shanann and her beloved granddaughters. Oh, my goodness. Reporter for nightline, im amy robach in frederick, colorado. I love you. Well be right back. This is amazing. With moderate to severe ulcerative colitis, are you okay . Even when i was there, i never knew when my symptoms would keep us apart. So i talked to my doctor about humira. I learned humira can help get, and keep uc under control when other medications havent worked well enough. And it helps people achieve control that lasts. So you can experience few or no symptoms. Humira can lower your ability to fight infections, including tuberculosis. Serious, sometimes fatal infections and cancers, including lymphoma, have happened; as have blood, liver, and nervous system problems, serious allergic reactions, and new or worsening heart failure. Before treatment, get tested for tb. Tell your doctor if youve been to areas where certain fungal infections are common, and if youve had tb, hepatitis b, are prone to infections, or have flulike symptoms or sores. 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