♪ 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

good evening, thanks for joining us. we begin with the mysterious death of a woman with ties to royalty found hanging from a r oyshe>>oundhanging.

>> reporter: 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, gagged. 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 and 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 she spent with max. >> i think there was dina made it difficult forrebecca. >> reporut no imagined just difficult to become. >> it was july 11 in the morning. >> dina had gone to work out in ece gym. >>he her sister. >> max wasn 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 thought, wow. >> did she tell you how she had the she said what happened i really don paints held vigil

and the next day his brother flew in. >> he was at home. they were the only two in house. exceedingly 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 the balcony. he called 911 have girl she hung herself. >> is she still youan y i masu the impact of something like that when was ly the biggest crisis of my life. >> reporter: if rebeccaken life it was a puzzling way to commit suicide. >> no woman woul their theirnd jump over a balcony.

>> 6-year-old max died -- consider the department has launched investigation. >> was max's death a homicide? the answer is no. was rebecca's death a homicide? the answer is max's death is a freak acci caused him trip. >> reporter: investigators say it was not homicide. that attacked. >> fingerprints from balcony doored all from rebecca. >> reporter: if it was suicide, how could she tie her hands behind her back in alicated way. atter of 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 sheeserved 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 ofn this millionaire's gir -- >> reporter: rebecca's on show. they exumes the body and cyril wecht examines the body. >> i lean strongly towards it being a homicide. >> they coroner 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. concluded that because her footprints were on the balcony she could have thrown herself off. but could an attacker throw her stepping on it and without leaving footprints. wise weisberg brought to this

baame is this the same size? good way to determine if it. >> reporter: letall 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 shovred it over. >> i'm not completely satisfied it's not a suicide but there is not evidence to shs a homicide. >> reporter: rebecca's family wanted justice and greer. he filed a case. but dina was the hospitalen rebecca died and greer dropped it from disgraceful abuse of the legal system. >> reporter: now targeted at adam shacknai.

>> you think that adam shacknai killed your sister? >> yeah i did. >> adam 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 tha none of his 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 >> reporter: the testimony beganesday. >> this truth that my sister did not commit suicide. >> theaway but no will bring ax back to his mother. >> i will never b i was withst miss having a 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.vers effective relief for moderate to even severe fibromyalgia pa and improves functiocase ns. tell your doctor right away if you have these, 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. don't drive or o'kely less pain, i can do more

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you know you can imagine drinking and singing or maybe drinking and falling b learning? that's the 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 you get the point. equipped withalcohol, 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 -- of lisa in florence. >> the drunk element of the show is the unpredictability. sometimes it's --unpredhapp >> reportein the ever characters 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 s 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 u n 2009 as a one time a e johnson, he is on "the new girl" and he is drunk and telling me a story. >> derek and jeremy konner enlisted their friend mark >> he a think and you reenayou beunk. said, what i in history you feel more people need to know about it. >> today we're going to talk about alexander hamilton. >> 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 researcherhaories that a we f that is a job, the stories that we were taught in school. >> reporter: after a few more drinks maready hi talking -- >> hi, i'm -- >> hello. >> reporter: well almost. >> hi i'm mark gagliardi and we are going to talk about the mona lisa. >> he is getting oxygen right now. i'm not sure -- we've definitely accelerated a little bit. >> when energy is low fromhe ox is of the dark. >> reporter: he wasn't lying. ♪ lik i should apologize how works.ento h the mona lisa. >> reporter: the words will m the

mouack black. >> of lisaence. >> 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 aing >> 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 t is 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 biblical real. that is the goal human humanizing eve including love you. >> i love you too. >> reporter: i'm getting my drunk history lesson in new york. up of moon light.ie and clyde take another shot at the oscars. no, please, please, oh! ♪ in terror) (heavy breathing and snorting)the bulldsurprising. what's not surprising? how much money aleia savedic fifteen minutes could save you fifteen percent or more. ief, you'll ask "what pulled muscle?" nothing works faster tin a distant memory. advil liqui-gels and advil liqui-gels minis. what pain? if these packs have the same number of bladder leak pads, i bet you think bigger is better. actually it's bulkier. always discreet quickly turns liquid to gel,

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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 eastern. >> from caesar's entertainment studios, it's happy couples week. each day, we're playing with some newly engaged couples who are hoping to win $1 million they can put towards the wedding so, don't move. it's time to play "who wants to be a millionaire." [cheers and applause] [dramatic music] ♪ ♪ hey, guys, welcome to happy couples week. are you ready to play "millionaire" today? [cheers and applause] well, from chicago, illinois let's welcome back jor and jahna, our happy couple. [cheers and applause] you guys are smack-dab in the middle of your game. you are halfway to $1 million. you're at $10,000.

seven questions in. seven more to go. almost there. >> almost. >> and you still have one more lifeline yet to be used. and by the way, since it's happy couples week, every time one of our players successfully answers the $5,000 question they not get that money, they also get a special prize. now, on the last show, you guys won a session of yoga in the sky on the high roller at the linq hotel and casino. and on today's show, players who correctly answer the $5,000 question will get this: dinner for two at the bacchanal buffet at caesars palace. with its nine kitchens, this amazing buffet offers abundant food choices in a variety of styles. guests can fill their plates to the top with selections such as prime rib, chilled crab legs handmade dim sum, and so