♪ this is "nightline." >> tonight, mansion mystery. a young beauty dating a pharmaceutical tycoon found naked, tied up and hanging at his palatial home. her death ruled a suicide but others want a look. >> you would have to throw yourself head first bound and gagged. >> who does that? i will tell you who does that. nobody. >> inside the investigation, the new civil case and what her family thinks really happened. plus, liquid knowledge? behind the scenes of the cast and creators of drunk history. the thing that turns sober topics into anybody but. >> today we're going to talk about the mona lisa heist.

>> how they pour their slurred words into the mouths of super stars like jack black. >> he painted this painting -- >> but first, the "nightline" five. number one in just 60 number one in just 60 seconds. at ikea, we believe that everything you need should be within reach. that anything that matches your taste can match your budget. that green living doesn't have to cost much green. we believe that you should always have room for the little things.

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good evening, thanks for joining us. we begin with the mysterious death of a woman with ties to royalty found hanging from a balcony bound and gagged. when authorities ruled it a suicide, her family launched their own investigation. here is the story. >>ed body was found hanging. >> reporter: the way rebecca zaau died was straung enough. >> having it happened is so shocking. >> reporter: the beautiful 32-year-old found dead hanging from the balcony, naked, gag authorities determine it was a suicide. >> it was obvious she was murdered. >> who does that? no. >> reporter: the family pointing fingers on the wrongful death suit. rebecca's farmly was royalty in the country once known as burma.

>> she was excited about life. >> reporter: a new boyfriend, he had a little boy named max. >> max loved ree becca. she was extremely attentive warm. >> dana wasn't crazy about the new girlfriend. >> someone else is going to be around your child. >> i thought we had a good working relationship together. >> did you approve of the time she spent with max. >> i think there was times when dina made it difficult for rebecca. >> reporter: but no one could have imagined just how difficult it was about to become. >> it was july 11th, in the morning. >> dina had gone to work out in the gym. >> rebecca was in the house with her sister. >> max was on the floor. >> and something awful happened. >> rebecca's sister calls 911.

>> he fell down the stairs. test not breathing. >> some how, 6-year-old max had haken a horrific fall. >> i sprinted in the house and i saw max laying on the floor. >> i first saw him, he had tubes coming out of every body. and i thought, wow. >> did she tell you how she had the happen in. >> she said, what happened, i really don't know. >> reporter: during the family emergency, the paints held vigil and the next day his brother flew in. >> he was at home. they were the only two in the house. >> they were

cordial. >> wednesday july 13th, 2011, adam walks into a scene of horror. >> adam was the one who came out of the guest house some time after 6:30 and he saw rebecca's body hanging from the balcony. he called 9 11. >> i have a girl, she hung herself. >> is she still alive? a >> i don't notknow. are you alive. >> adam is able to cut her body died and e he is trying to e resuscitate here. >> can you imagine the impact of something like that when i was already facing certainly the biggest crisis of my life. >> reporter: if rebecca had taken her own life, it was a puzzling way to commit >> no woman would bind their hands behind their back and jump

over a balcony. >> 6-year-old max died -- consider the sheriff has launched investigation. >> was max's death a homicide? the answer is no. was rebecca's death a homicide? the answer is >> reporter: max's death is a freak accident. >> something caused him to trip. >> reporter: investigators say it was n a homicide. dna shows no sign that she had been attacked. >> fingerprints from the balcony door and the bed were all from rebecca. >> reporter: if it was suicide,

how could she tie her hands behind her back in a seemingly complicated way. >> just a matter of slipping her hand out. the bindings were not tight. >> he treated my sister like garbage and i believe they felt like they came to a quick conclusion that becky had something to be with max's and she deserved what she dot. >> reporter: did you ever believe that your sister was suicidal? >> no, rebecca does not the have a suicidal personality at all. >> reporter: rebecca's family turned the outrage into action. >> the cause of death in this millionaire's girlfriend -- >> reporter: rebecca's story is on the dr. phil show. they exumes the body and

wecht examines the body. >> i lean strongly towards it being a homicide. >> the san diego county examined it. >> it was on the dr. phil show. it's terrible. >> he can say it's foolish. we say it's justice. >> reporter: rebecca's family petitions to reopen rebecca's case but in a crushing blow, the request is denied. >> the interest in the case remains years and years and years later. i hope somebody looks again. >> reporter: it turns out someone is re-examining the case. his name is herman wiseberg. he is a seasoned private investigators in new york city. "20/20" obtained him to

investigate the case. he has things to say about what happened on the balcony. they concluded that because her footprints were on the balcony, she could have thrown herself off. but could an attacker throw her off without stepping on it and without leaving footprints. wi weisberg brought me to this balcony, roughly the same tice. is this the same size? >> similar, a little heavier. it's a good way to determine if i can do it. >> reporter: leall right, let's see if you can do it. >> it's not easy. >> reporter: it's not easy but it's possible for to you not step out there. >> it shows that someone could have taken e rebecca's body, put

it down, leaned it against that rail and shoved it over. >> i'm not completely satisfied it's not a suicide but there is not evidence to show it was a homicide. >> reporter: rebecca's family wanted justice and filed keith greer. he filed a case. but dina was at the hospital when rebecca died and greer dropped it from the suit. >> i think it's a disgraceful abuse of the legal system. >> reporter: now his case is targeted at adam shacknai. >> you think that adam shacknai killed your sister? >> yeah, i did. >> adam was there over night and nobody else was. >> first, there was a confrontation. shortly after that, she was hit on the back of the head four times. she was strangled before she went over the deck.

>> reporter: adam's attorney says none of it makes sense. adam says he never left the guest house that night and none of his dna or fingerprints were found. his attorney says there is no evidence tying his client to rebecca's death. >> the matter of -- >> a jury is finally hearing the evidence. >> what is the deft -- >> it's a civil case, not criminal, but soon there will soon be a verdict. is adam responsible? >> not one single the witness, we have in testimony that adam shacknai did any of those things. >> reporter: the testimony began wednesday. >> this is only about finding the truth that my sister did not commit suicide. >> the verdict is a month away but no decision will bring little max back to his mother.

>> i will never be as happy as i was when i was with max. just miss having a life with him. >> reporter: for "nightline," in coronado, california. up next, they caught lightning in a bottle with the hit serious "drunk history." i feel chronic, widespread pain. fibromyalgia may be invisible to others, but my pain is real. fibromyalgia is thought to be caused by overactive nerves. lyrica is believed to calm these nerves. i'm glad my doctor prescribed lyrica. for some, lyrica delivers effective relief for moderate to even severe fibromyalgia pain. and improves function. lyrica may cause serious allergic reactions, suicidal thoughts or actions. tell your doctor right away if you have these, new or worse depression, unusual changes in mood or behavior, swelling, trouble breathing, rash, hives, blisters, muscle pain with fever, tired feeling, or blurry vision. common side effects: dizziness, sleepiness, weight gain, swelling of hands, legs and feet. don't drink alcohol while taking lyrica.

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you know, you can imagine drinking and singing or maybe drinking and falling but drinking and learning? that's the crazy concept behind the hit series "drink history. abc's rebecca jarvis takes us behind the skins. >> reporter: drinking on the job

is typically frowned upon but not at this workplace. here at this air bb in downtown manhattan, the lights are being adjusted, the host and comedian are having a drink, and another drink, and you get the point. equipped with plenty of alcohol, a breathalyzer, an oxygen tank and a medic, we are on the scene of "drink history." it's the hit the comedy cent ral show where a story teller telling a story, and actors and comedians retelling the story. >> lip sinking to the drunken counter pars. >> he painted this painting -- he painted this painting -- lisa in florence.

>> the drunk element of the show is just the unpredictability. sometimes it's -- hi, the unpredictable happens. >> reporter: the ever changinging cast of characters hangs from will ferrell to ryan gosling and eva mendes and octavia spencer. >> whoever is down to help the union, just let me know. >> and i allow anyone to come see how he shoot account drunk history". >> derek waters is the host of the show that started as a web series. you have been doing it now for a couple seasons. how did you come up with it? >> it started in 2009 as a one time idea. it was based on a friend of mine, jake johnson, he is on "the new girl" and he is drunk and telling me a story.

>> derek and jeremy konner enlisted their friend mark gagliardi. >> he said, i want to talk about a think and you reenact it and he said, i want to you be really, really drunk. >> and i said, what is a moment in history you feel more people need to know about it. >> today we're going to talk about alexander >> reporter: how far did you stop knowing what is going on. >> i remember moving from a chair to a couch and after that, it's hazy. >> reporter: the guys thought it was a one-time video until jeremy's former boss, jack black, saw it. >> i was jack's assistant at the time and he said, i want to do one and we did the ben franklin one and now we are doing a series. >> reporter: five seasons later, the show comes full circle tonight with mark as narrater

once again. how did you choose the stories? >> we have a great team of researchers that dig for the stories that are hidden in history books and e we feel that is a job, the stories that we were taught in school. >> reporter: after a few more drinks, mark is ready to tell his story. >> i'm mark gagliardi and we'red going to be talking -- >> hi, i'm -- >> hello. >> reporter: well, almost. >> hi, i'm mark are going to talk about the mona lisa. >> he is getting oxygen right now. i'm not sure -- we've accelerated a little bit. >> when energy is low from someone. and ten minutes of the oxygen, and it's like, he is coming out

of the dark. >> reporter: he wasn't lying. ♪ >> i feel like i should apologize because i'm drunk but this is how the show vince vincento has just stolen the mona lisa. >> reporter: the words will make it into the mouths of jack black. >> of lisa, in florence. >> you do have to kind of memorize the lines because your lips have to go -- lip syncing is not as easy as it looks. there's an art to it. there is a silent artistry involved. >> ready, and action. >> reporter: it's a different kind of acting skill. >> you are playing the scene based on a drunken narrater's perspective. i never play it drunk. i play it as straight as possible. as to if this is really how the

history went down. >> we shoot so many hours to create five minutes of content. and it's really because half of the time it's just -- 90% of the time it's just wrangling someone to tell the story. >> reporter: in new york, distractions were at an all time high. ♪ people in history, you don't necessarily see as humans. >> exactly. we see them as almost biblical, fables. but they are real. that is the goal of the show, hum humanizing everybody, including people who have drunk. >> i love you. >> i love you too. >> reporter: i'm rebecca jarvis getting my drunk history lesson in new york. up next, out of the shadows of moon light. hollywood's bonnie and clyde take another shot at the oscars.

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at ikea, we believe that everything you need should be within reach. in an affordable dream kitchen that works as hard as you do. ikea family members get 15% back when you spend $2000 or more at the ikea kitchen event. and finally tonight, it's a classic hollywood redemption

story. the duo who got stuck with last year's best picture oscar blunder -- >> "lala land". >> might be getting a do over. warren beatty and faye duneway will be back to give out the award. here is hoping bonnie and clyde finally get their happy ending. be sure to catch the oscars sunday night at 8:00 eas