whitney houston's final hours. nuclear standoff. it happened in japan. could it happen here? >> i always thought it was fatally flawed. unfortunately, fukushima proved me right. >> safety concerns over an aging nuclear facility. deadly cargo. would you believe this laser printer is a weapon of terror? we'll show you how al qaeda got these printer bombs through security and onto planes. revealing investigations, fascinating characters, stories with impact. this is cnn presents with your host tonight, randi kaye and dr. sanjay gupta. >> good evening. whitney houston will be remembered as one of the greatest voices of her generation and many of her closest friends say the troubled star was poised to make a comeback. but that comeback, as you know, was tragically cut short with her untimely death. >> whitney houston's soaring talent was shadowed by her struggles with addiction and her marriage. don lemon looks at her rise to fame, her fall from superstardom, and final hours in her troubled life. ♪ but above all this i wish you love ♪ >> that legendary ballad, that blinding beauty. ♪ and i will always love you >> that breathtaking voice. ♪ i will always love you >> whitney houston, the shy jersey girl who belted her way to superstardom. six grammys and a record seven consecutive number one singles. for a time she was pop's greatest love of all. ♪ is the greatest love of all >> to hear her voice was a miracle because for anybody to be able to do with a voice what she did with hers speaks to a divine order. >> whitney houston, the icon, unimaginably talented, but also fatally flawed. >> there were many different sides to whitney. there was the performer, the consummate professional. there was the addict, and you never knew which whitney you were going to get. >> if houston was blessed by the heavens, she was most certainly cursed with her own demons. a contradiction right up to her final days. >> this was not a woman who was depressed, upset, high, drunk. >> it was immediate. you could smell the stench of cigarettes and liquor, and i am just like, oh, my god, she's a mess right now. >> whitney houston died here at the beverly hilton on february 11th, the voice of a generation silenced forever. a tragic ending to a life filled with promise that was almost preordained. with a gospel legend for a mother, and a cousin named dionne warwick, houston was born to sing. >> when we first saw whitney, when you first heard whitney, you knew there was something special happening here. >> legendary music producer clive davis certainly knew. he discovered houston and changed her life forever. he packaged and polished the 19-year-old sensation into a pure pop princess, at least on the surface. >> one source who worked with whitney told us she definitely was not a goody two-shoes in any sense of the word. >> houston's bad girl side may have ultimately drawn her to r&b bad boy bobby brown. >> she was a girl from the streets of newark and fell in love with a bad boy with a good voice, so, you know, her fans, yes, very shocked. those who knew her best really weren't surprised. >> houston and brown traded rings in 1992, a personal high matched only by a professional one that very same year. "the bodyguard" grossed more than $400 million and launched the top selling soundtrack of all time. but even as the crossover superstar commanded millions for movies like "the preacher's wife," she increasingly struggled with her fame. >> did she ever talk to you about the stress of fame? >> she said to me, you don't know what it's like being me. i'm stressed out all the time. >> that stress was only compounded by houston's often rocky marriage. >> they were very happy at first, but pretty soon their relationship turned pretty volatile. and when she was under pressure, she tended to turn to drugs and alcohol. >> when houston began a string of missed appearances and cancelations, many pointed their finger at bobby brown for his wife's mounting troubles with drugs. >> i hate to say that she had started before she had met bobby brown. >> we got to live with -- >> houston's increasingly erratic behavior even played out before the cameras in the short-lived reality show "being bobby brown." but when brown spoke to cnn in 2005, he insisted that he and his famous wife were finally sober. >> i am working on a year and a half of sobriety. and my wife is, she's working on her year. so we're really doing good and i'm proud of her. >> yet her attempts at recovery only ended in relapse for houston and the years of drug abuse had taken their toll. >> i was shocked at her condition. her vocal condition. >> what happened to whitney houston's voice? >> i think that the psychological impact of being who she was drove her into lifestyle habits that ultimately were destructive. >> by may 2011 whitney houston was divorced. her attempt at a comeback a year earlier was in shambles. with all of these crushing personal setbacks, she entered into a voluntary outpatient program for drug and alcohol treatment. friends say she just needed a break. >> i know that she was pacing herself because she was preparing for the movie. i don't know exactly what she went through to do that. >> that movie was "sparkle," and by the time whitney houston began doing press for the film, she did seem like a different woman. access hollywood's sean robinson did the last one-on-one interview with her. >> when i looked at whitney houston in her eyes, i thought that this woman is coming back. >> but looks can be deceiving, especially when you're talking about whitney houston. her final days when we return. fore! no matter what small business you are in, managing expenses seems to... get in the way. not anymore. ink, the small business card from chase introduces jot an on-the-go expense app made exclusively for ink customers. custom categorize your expenses anywhere. save time and get back to what you love. the latest innovation. only for ink customers. learn more at chase.com/ink but think about your heart. 2% has over half the saturated fat of whole milk. want to cut back on fat and not compromise on taste? try smart balance fat free milk. it's what you'd expect from the folks at smart balance. metamucil uses super hard working psyllium fiber, which gels to remove unsexy waste and reduce cholesterol. taking psyllium fiber won't make you a model but you should feel a little more super. metamucil. down with cholesterol. ♪ with a new movie and a new sparkle of her own, a seemingly healthy whitney houston started the new year poised to perhaps make that long-awaited comeback. but behind the scenes, some now-all-too-familiar and alarming behavior. >> well, her friends told us that even though she had successfully gone to rehab last year and had this great experience filming "sparkle," there are always temptations, and unfortunately she started partying again and spending time with perhaps the wrong people. and just fell right back into that sad spiral. >> three days before the annual grammy awards show, whitney houston was staying here at the beverly hilton. it is here where over several days, sources say the pop superstar was seen consuming considerable amounts of alcohol and acting erratically. garrett kennedy of "the l.a. times" was covering a pre-grammy press event at the beverly hilton when the singer raised eyebrows at the hotel pool. >> one of the conversations i had with a grammy staffer was that security was getting calls from guests that she was doing handstands by the pool. i was like, oh, that's pretty bizarre. >> and then there was this. kennedy says houston smelled of cigarettes and alcohol when she burst in on her mentor clive davis. >> come say hi to your godfather. >> hi. >> come say hi to your goddad. >> i am like, oh, my god, you are a mess right now and you are embarrassing yourself. i'm embarrassed for you. >> the pop star appeared anything but disheveled or disoriented later that night. >> whitney houston attended a pre-grammy party at this hollywood nightclub. and as she walked the red carpet, witnesses say she had it together and was on her best behavior. adam ambrose is a publicist for "true hollywood". >> she walked along here, holding hands, in fact, with bobbi kristina, and they both looked radiant. when they arrived, they were looking fantastic. >> houston was even up for a little impromptu entertaining. she surprised everyone when she joined her friend, r&b nominee, kelly price, on stage. ♪ >> the place erupted. it was very sweet. it was actually really touching. and then she went off. >> fun times, but too much of a good time? not so says kelly price. while she says that houston had champagne at the party, she denies reports that things got out of hand with her friend. >> this was not a woman who was depressed, upset, high, drunk. she was clearly in her right mind. she was not acting erratic. >> but ""access hollywood's"" shaun robinson says the pictures taken that thursday night tell a whole different story. >> i said, who is that? what the hell happened? what happened in three months that took her from this person who seemed to really have it all together to this person who looked very disheveled and just kind of not there? >> in a sad reality, houston hadn't been herself in years, at least not the one fans had come to love at the height of her superstardom. her struggles with addiction, the loss of her once incomparable voice, the pressures of fame had all but destroyed houston's once magnificent facade, and by saturday, february 11th, any hope of a comeback would be over. hours away from attending clive davis' annual pre-grammy celebration, whitney houston was in her fourth floor suite here at the beverly hilton when a music executive staying on the floor above hers was jolted awake by a loud thud. >> a member of her entourage went in and discovered her unconscious in the bathtub, partially submerged. the member of the entourage called 911 immediately. >> within minutes paramedics arrived making desperate attempts to revive her. >> her brother gary was in the room and his wife pat, obviously praying for a miracle. >> houston's close friend kim berell received a troubled call and raced over to the hotel. >> you could feel that something was terribly wrong, and by then i saw the yellow police tape down the hall. i rushed to the room and i said what's going on here? and pat told me, she's gone. >> whitney houston was dead. on the heave of music's biggest nights, one of its biggest icons was gone. she was only 48. >> bobbi kristina broke down in the hotel lobby and was screaming over and over again what's wrong with her? what's wrong with her? so we can only imagine what was going through this girl's mind, but her mother was her world. >> i wanted everything to just stop. wait a minute. because what i felt was happening, i didn't want to be happening. >> a source close to the death investigation tells me prescription drugs, including xanax, were found in whitney houston's hotel room at the beverly hilton. the coroner's office hopes subpoenas of houston's medical records will help them learn more. but they're waiting for toxicology reports to determine exactly how the singer died. what actually happened to whitney houston is still a mystery and still under investigation. whatever caused her death, the fact remains that a life built on triumph ended in tragedy. but for those who knew her, the mega-star known as "the voice" will always sing on. >> when someone like that dies, the music takes on a new meaning. the music takes on a meaning now that whitney is not here, and the song that makes me very emotional was that song "all at once," and the lyrics are so strong. ♪ all at once >> and then it hit me, that you're not coming back, all at once. ♪ and i'm realizing that you're not coming back ♪ ♪ and it finally hit me all at once ♪ coming up, a troubled nuclear facility at the center of a debate that could determine the future of nuclear energy in the united states. what makes the sleep number store different? 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we're here in vermont where there's a battle brewing that could determine the future of nuclear power for the u.s. at the center of this battle, this nuclear plant, the same design as fukushima. the vermont yankee nuclear power station is 40 years old. it's operating license issued by the u.s. nuclear regulatory commission, or nrc, is set to expire next month. it's one of 23 mark-1 design nuclear reactors in the u.s. the problems with this design are well known to industry insiders, including the nrc, according to government documents dating back to 1972. >> 1972 the nrc said we never should have licensed this mark-1 design, period. but they also said, we've got so many of them licensed already, that if we were to change our mind, that would ruin nuclear power forever. >> arnie gunderson is a former nuclear industry executive turned whistle-blower, with decades of experience in the industry. he's been appointed the chair of the state panel overseeing the vermont yankee reactor. he says because of design flaws, vermont yankee and other plants like it across the u.s. are one major earthquake, tornado, or flood away from disaster. and that's a fear bordering on reality after massive floods and tornadoes hit vermont last year. if something were to go wrong at vermont yankee, this would be the damage area, and given its recent history under the ownership of a company called entergy, there is reason to be concerned. let's go over this list one by one of all these mechanical errors. >> we had six piping leaks in the plant, three piping leaks in the ground, then we had the fire and the cooling tower collapse. and that's just in the last five years. >> is this normal? >> it's not normal when cooling towers collapse. it's the only time in the history of nuclear power that a cooling tower has collapsed. the key is why the fire? why the tower collapsed? and in every case, we've been able to trace it back to inadequate maintenance. every one of the major failures could have been preventable. >> none of these problems would lead to a meltdown, but show a pattern of sloppy maintenance. vermont yankee sits on the connecticut river across from this elementary school. nrc reports show the plant has been leaking radioactive materials into the environment for years, although at levels the agency says are safe for the public. >> they found six or seven different isotopes, most of which last a long time. >> in 2010 a fish caught in the connecticut river tested positive for strontium 90 in its flesh. strontium-90 seeks out bone, causing leukemia, and it doesn't leave the environment for 30 years. for gunderson, the logical source was vermont yankee. >> i think if you find a fish with radioactive strontium next to a plant that's leaking radioactive strontium, a pretty high correlation that the strontium and the fish came from the plant. >> but so far, testing has suggested otherwise. this is dr. bill irwin, and he's with the vermont department of health. and this is where you keep the fish that you caught in the coun connecticut river? >> yes, this is correct. >> a recent study released by dr. irwin showed that fish almost 150 miles away in a lake had strontium in them. he believes caused by fallout from nuclear testing. >> the other place that we have found strontium-90 is in the natural environment everywhere, not only in that area of vermont, but all areas of vermont, and throughout the world. and again, it comes from fallout from nuclear weapons testing. >> but more tests need to be conducted to be certain. despite its age and recent problems, last year the nrc granted vermont yankee a 20-year extension. so instead of closing in march 2012, it could now be open until march 2032. >> where i have had problems is that the nrc has in some cases become a cheerleader for the nuclear industry. clearly, the nrc has got to be vigilant. >> vermont senator bernie sanders sits on the senate committee that oversees the nrc. he's worried as an older generation of america's reactors comes up for renewal. >> they have always extended when companies have come in and said, we would like an extension. i believe in over 60 instances, they have granted every one. and that's a problem. that's a problem. >> we wanted to talk to the nrc. over a six-week period, we repeatedly requested an interview at any time or day of their choice. but we were told they were overbooked. so we decided to show up anyway and see if we could get some answers. a spokesman came outside soon after we arrived. >> you've received the agency's response via our director of public affairs. >> yeah. >> the answer of the agency. >> so no one's going to talk to us? >> no. >> i actually have the exact quote here on your site. it says that the nrc is devoted to open government, open, accountable, accessible. >> yes, all of our information is available on our website. >> but if you guys are accessible to the public, how come you can't sit down with us for a five-minute interview to explain your side of the story? >> because the subject that you want to discuss is something that is currently a matter of litigation that the agency cannot discuss. >> but we don't just want to discuss the entergy plant, sir, we want to discuss overall how the nrc is regulating nuclear power in the united states. >> one reason the nrc wouldn't talk to us is that the vermont yankee plant is at the center of a pitched legal battle over who decides the reactor's fate, and the stakes are enormous. >> this case coming out of the little state of vermont has potentially very real national consequences. >> coming up, will the people of vermont have a say in their own nuclear future? 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