this is "nightline." tonight, twists and turns. a connecticut mom missing for more than three months. her estranged husband and his girlfriend the object of intense interest. now the surveillance maenls, shedding new light on the mystery. and virtual vip. getting the party started, with front-row access from the comfort of your couch. tapping into virtual reality like you've never seen before. the live music app, bringing users on stage. but first, the "nightline" five.

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targeted in the investigation into her disappearance. here's whits johnson. >> reporter: a case of truth and lies in connecticut. a connecticut mom missing for more than three months. her disappearance a mystery. police think they're close to solving. >> the main players in the disappearance of jennifer have been arrested again. they surrendered to face new charges. >> reporter: yesterday, jennifer's estranged husband taken into custody for a second time and again charged with tampering with evidence in her disappearance. >> there's not much here that we haven't heard before, and i question the wisdom of these charges at this late date. we intend to plead not guilty to these charges. >> it's an exhausting fight. i love my children. >> where's the murder charge? >> reporter: today his girlfriend also arrested, facing that same tampering charge. >> remember, that michelle is

presumed innocent, and she should be. >> reporter: police released detailed, 38-page warrants, complete with surveillance images, cell phone data and dna analysis, showing a trail of suspicious activity in the days following jennifer's disappearance. critical new evidence includes him admitting that she had not been truthful during previous questioning. >> the detectives have slowly bit what appears to be a circumstantial case. >> they clearly think he committed the murder, but they want to put all the pieces together before officially charging him with that crime. >> reporter: the mystery started in the wealthy tree-lined suburb in connecticut. >> all the rich people in new york city leave in the afternoons and go to new canaan. that's where they live. it's quite the enclave. long story short, there are not a lot of murders and kidnaps going down in the mean streets of new canaan. >> reporter: it was a friday morning in late may. almost the end of the academic

year when jennifer dropped off her five children for school. surveillance cameras show she returned to her rented home around 8:00, then vanished. >> we love you. and we are doing everything we can to bring you home. >> reporter: hours later, worried friends called the police after she missed several appointments. her disappearance sparked an intense search stretching across state lines, making headlines in the national news. >> new developments in the case of that missing mother of five. >> overnight her estranged husband speaking in a new interview. >> her estranged husband and his live-in girlfriend appearing in court. >> cops immediately start with a timeline and try to figure out if she left on her own. but then they discover her suv, seemingly abandoned. >> reporter: drones, k-9s and a helicopter scoured the area. her vehicle found near a wooded park. but key evidence inside the home, a police affidavit reveal that authorities found numerous

bloodstains on the garage floor, numerous areas of suspected blood spatter and evidence of attempts to client scene. >> it says blood spatter. spatter. that's significant. >> reporter: that affidavit showing jennifer was the suspected victim of a serious physical assault. jennifer had been in the midst of a bitter divorce battle. she seemed to fear for her safety, claiming in 2017, i am afraid of my husband, i know filing for divorce and filing this motion will enrage him. i know he will retaliate by trying to harm me in some way. he strongly denied any threatening behavior, calling his wife incapable of parenting, because she allegedly was taking anti-psychotic and anti-anxiety medications. >> i've seen it so many times, and every time it's heart breaking. jennifer said at the time the split started, she was afraid. she was afraid to file for divorce.

she was afraid her husband would seek vengeance on her. >> reporter: little more than a week after jennifer's disappearance, the first arrests. her husband and his live-in girlfriend michelle. that police affidavit in june found clothing and sponges stained with what appeared to be blood found in the trash. investigators say surveillance cameras captured a man appearing to be him disskardicarding more 30 garbage bags. the blood confirmed to be jennifer's. >> where is she! >> reporter: they appeared in court on charges of tampering with evidence and hindering prosecution. three months later, a similar scene. the new detailed police arrest warrants, complete with time stamped surveillance maeimages spell out how they say he lied to them about potential alibis. he had an alibi script that he

and his girlfriend had been rehearsing. she had told police she and he took a shower together the morning jennifer disappeared, providing an alibi for him. now she admits she did not see him that morning. instead, police believe he was at jennifer's house, lying in wait. >> what's so significant isn't just that she's talking to police. but it sounds like she's offering incriminating evidence. the minute he loses her as his alibi witness, a lot of his defense gets much, much weaker. >> reporter: investigators also say dulos borrowed a co-worker's red tacoma. blood matched jennifer's, something they questioned him about last month. >> reporter: she also was asked about why that truck was taken to be washed in detail, and she told the police, well, you told me there was blood there, so it

must be because jen everyone's body was inside that truck. >> reporter: this tragedy just the latest in a string of cases in what were once romantic relationships turned violent. police in colorado were conducting the investigation into the disappearance of shanann watts and her daughters. her husband chris initially lied to police before confessing. >> whereabouts? is shanann and the girls? >> reporter: watts said he buried his two daughters in oil tanks and their pregnant mother in a shallow grave, pleading guilty to murder in exchange for no death penalty. his description of how he killed them, horrifying. >> so she went into the tank, and bella was still in the back of the truck alive. >> she asked if the same thing is going to happen to me. put that blanket over her. she said no, daddy.

>> reporter: watts is now serving life in prison without the possibility of parole. another notorious case in colorado. last december, patrick was arrested a month after his wife vanished. they shared a daughter. this surveillance video inside a woodland park safe way captured the last known images of her shopping with the baby. ten days later, her mother, not her fiance, reported her missing. >> she's not the kind that runs off. >> reporter: they didn't live together. and according to police, phrasy told officers he hadn't seen his fiance since thanksgiving when he picked up their daughter kaylee. he remains in custody and has pleaded not guilty to murder. >> reporter: back in connect, the disappearance of jennifer remains unsolved. the five children living with their grandparents. their father fighting for

custody. for now, they are out of jail, fitted with ankle monitors. law enforcement watching their every move. >> what they don't want to get accused of is rushing to judgment. and so they're taking their time, putting the case together, but it's clear that they think that he committed a murder. >> reporter: for "nightline," i'm whit johnson in norwalk, connecticut. >> he is due in court next week. up next, imagine a front-row seat to imagine dragons. the new virtual reality app that lets you see concerts up close from your living room. (door bell rings) it's open! hey. 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.

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"nightline" continues. here again, deborah roberts. >> it might just be better than a back stage pass. a new virtual reality app that let's you see live concerts from the middle of the crowd. the front row or even on stage. it's your choice from your couch. here is abc's kimberly brooks. >> reporter: if you want to rock out with a band like imagine dragons, party with wiz khalifa, or hang with kelly clarkson, all without getting out of your pajamas, well you're in luck. there's a new frontier in virtual reality. a multi-billion dollar industry. now a pioneering live music app called melody vr is allowing fans to go from couch potato to

virtual vip with a touch of your screen. >> literally you can watch my entire "meaning of life tour via vr. everyone's here, my whole tour is on vr. >> reporter: marshmello and country star kane brown rocked the stage at gma's summer concert with their hit "one thing right." and viewers everywhere, on their phones, were able to get that immersive experience too. we went behind the scenes where, for the first time, as melody vr live streamed a live televised concert. >> marshmello are you excited? >> i think it's awesome. i've been trying to get virtual reality for a while now. i'm a big gamer and i know mello's a big gamer. so i think it'll be cool. >> there's all these cameras all around the stage that give people 360 views of all these different angles, so you're under complete surveillance.

>> so we gotta worry about what we look like all over the place >> if you want to jump to a different location, a different jump spot, you take it here and it will take you to the other location on the other side of the stage. >> reporter: melody vr's ceo anthony matchett was an audio engineer when he began developing the app. >> well when i saw the first early prototype of an oculist rift i thought wouldn't it be amazing if you could put me on stage with rolling stones and charge me 10 dollars to do. >> reporter: today he's showing us how it works, without the glasses required for most vr. >> i think when people think of vr they normally think of the glasses or they think of the oculus that is necessary. but for this. no? >> so if you have ant oculus you can download that app on there. but so many people that don't have an oculus is really important for us as well to be on mobile to give people without the device.

>> reporter: the cameras film at 360 degrees creating an interactive experience where viewers at home have control over their view. it's now being studied as a pain management at cedar sinai in los angeles. >> they'll come out of the er and say i feel calm and peaceful now. i'll say how's your pain? and sometimes they'll say oh, my god, i forgot about that. >> reporter: and in chicago, the chicago pd launched a pilot program that uses vr to train police officers on how to interact with people experiencing a mental health crisis. but most are still using virtual reality for pure entertainment. we decided to experience it first hand at vr world in new york city. you must be adam. >> i am. you must be kimberly. >> reporter: i am. nice meeting you. i'm excited. adam is my tour guide and

teacher. vr world is a virtual reality playground, with three floors of insane virtual reality experiences. stuff you can do alone. >> select your weapon for this round. >> reporter: games you can play in pairs and adventures that require a whole group. it's all happening. so i get warm the up on an experience for artists. we start with controllers, and then of course the goggles, called the okculist, then i'm off, completing my own rainbow masterpiece. this is bananas. what in the world? then it's time for the most popular, an epic battle with zombies. we join forces with a couple of our new friends. now time to try the infamous

plank. the elevator ascended and then the doors open. wow, oh, my goodness. oh, my god. and the full-body terror set in. this is crazy. >> what's wrong? >> reporter: i actually froze. oh, my god, i can't look down. >> you see the plank? >> jimmy: this is so wild, you guys. i don't even know how to explain this. >> so we're going to walk across the plank. >> jimmy: oh, my god. i have tears in my eyes, i'm not even joerking. >> two hands, i've got you. >> jimmy: it took some serious coaxing to get me to take that first step. >> the next step is the leap of faith. >> jimmy: the virtual reality battles with the part of your brain that knows you're only an inch off the ground but also believes you're 80 storeys in the air. there's the helicopter, oh, god. each step is a fight to maintain your balance. this is crazy.

and then there's the air, a little fan simulates the wind. that makes it so much harder. then at the end of the plank, a step of faith. it's just one inch in real life, but so much more in virtual reality. this the ground? >> a little bit more. reach your foot out. you've got it. >> jimmy: i know, what's happening? >> there you go, there's the ground. >> jimmy: i'm standing there safe and sound, but i feel like i'm falling. oh. that is crazy. oh, my god! >> you did it. >> jimmy: that is sorazy! wow, guys, i don't even have words. back in central park, the concert is in full swing and fans around the world see the duo perform the hit song "happier." ♪ i've been thinking, i want you

to be happier ♪ ♪ i want to you be happier >> reporter: after the show, a sense of relief mixed with excitement for the team. >> they sit on their couch and literally see everything on the stage. it's another thing i can say. >> reporter: for "nightline," i'm kimberly brooks in new york. next, the tennis legend on track to avenge last year's disappointing u.s. open final. ♪ ♪ ♪

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plus a speed upgrade to 400 megs, free for 2 years. and ask about even more savings with xfinity mobile. click, call, or visit a store today. >> reporter: finally tonight, the record in sight. looks like tennis superstar serena williams is on the way to breaking her u.s. open curse. winning a spot in saturday's final and eyeing her 24th grand slam title. a record number of grand slams if she prevails. the iconic tennis star securing her spot after dominating the semi-finals tonight. williams is the last american woman or man left standing in

this year's competition and was rewarded with a standing ovation tonight. that's nightline. you can always catch our full episodes on hulu. good night, america.