tonight on "nightline," the shooter on the stand. >> i thought i was going to be killed. >> the man accused of murdering 17-year-old jordan davis after an argument over loud music tells his side of the story. >> and i said you're not going to kill me, you son of a [ bleep ] and i shot him. >> but if he was so scared why did he go back to his hotel room afterwards and order pizza? separated a at birth. two strangers living on the opposite ends of the planet meet on facebook and realize that they look exactly alike. their surprising emotional mission to find out if they're twins who happen to uncover a family secret via social media. and best of show.

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punishment." >> i'm looking out the window and i said you're not going to kill me you son of a [ bleep ] and i shot. >> reporter: in his own words and in riveting detail -- >> it wasn't just my life i was worried about, you know? >> reporter: admitted killer michael dunn recreates for the jury moments that led to the shooting death of 17-year-old jordan davis. >> did you notice any differences about your body physically? >> i'm shaking. i'm quivering like a leaf. >> reporter: prosecutors call it cold blooded murder. dunn maintains it was self-defense. it started when dunn and his fiancee rhonda rower pulled into a jacksonville, florida, gas station in november 2012. they parked in ex-to an suv full of teens. >> body panels on the suv were rattling. my rear-view mirror was shaking. my eardrums were vibrating. this was ridiculously loud music. >> dunn's fiance testified the

47-year-old software developer had this reaction? >> and what did the defendant say? >> i hate that thug music. >> reporter: rower went inside to buy a bottle of wine. seconds later, gunshots. >> oh, my god. somebody is shooting. >> reporter: dunn pulled his semiautomatic pistol out of the glove box and fired ten times. today he testified while she was in the store he talked to the young men in the suv and said can you turn that down, please. they turned it off. if the music wasn't off, at least the base stopped completely. >> okay. and at that point, what did you say? >> i said thank you. >> reporter: dunn said the pleasantries didn't last long. he said the 17-year-old in the rear passenger seat started mouthing off. >> i should [ bleep ] kill that [ bleep ]. now he's screaming. there's no mistake of what he said. that is what he said.

>> reporter: today, dunn tried to convince the jury jordan davis was a foul moout mouuthedn wielding teen who actually pointed a gun to him. >> to my eye it was a 12 gauge, maybe 20. he said yeah, i'm going to kill you. i'm looking at a barrel. he's showing me a gun and he's threatening me. anticipa and after he opened the door, he looked at me and said you're dead [ bleep ]. >> at this point, what did you believe was about to happen to you? >> i thought i was going to be killed. >> reporter: that was only one of the buzz words dunn used to try to convince this jury the shooting was self-defense. he seemed to hit them all. >> i was still fighting for my life. i knew i had done nothing wrong. i had every right of self-defense and i took it. >> reporter: but prosecutor john guy would have none of it. jordan davis was never a threat to you, was he, mr. dunn? >> absolutely he was.

>> reporter: as soon as his cross-examination began, we reminded why defense attorneys cringe when their clients take the stand. >> i don't want to call it an act of desperation, but they really had no choice. without his testimony, there was no evidence of self-defense. all you had was a man shooting nine times into a car with a bunch of teenagers. he would easily be convicted. so he had to get on the stand. he had to explain why he fled the scene and why he didn't call 911. >> you were being disrespected by a mouthy teenager, weren't you? >> no, i was being threatened. threatening to kill somebody isn't a disrespect. that is just crazy. >> reporter: prosecutor guy reminded the jury no gun was found in the teens' suv and grilled dunn on every inconsistency. including the fact that his own fiancee said he never mentioned

a gun the night this happened. >> you did not tell her in that three miles anyone pulled any weapon on you, did you? >> i think i did. i think i was very clear that they threatened my life. >> reporter: my question was did you tell her they had a weapon of any kind? >> yes, i did. >> reporter: mr. dunn, the truth is you never told the love of your life that those boys had a gun. >> you weren't there. >> reporter: all right, ma'am, if you come right around here. later, prosecutors brought his fiancee back to the stand to hammer home the point. >> did the defendant ever tell you he saw a gun in that red suv? >> no. >> back in the hotel room that same night, did the defendant ever tell you he saw the boys with a firearm? >> no. >> did he ever tell you he saw the boys with a weapon? >> no. >> reporter: dunn claims the fiance got something else wrong, the last words she heard him say

before the shooting. >> i hate that thug music. >> reporter: you don't recall saying i hate that thug muse snik. >> no, if i staal called it anything, i would call it rap crap. thug music isn't something i say. >> reporter: he was quizzed about his behavior after the shooting. >> mr. dunn, you left the gas station because you knew you had shot into the car of an four unarmed teenagers. >> reporter: dunn acknowledged that he and rower fled the scene of the shooting and never called police. instead, they returned to this hotel and ordered pizza and made some cocktails. >> i didn't call the police until the following morning. >> reporter: you called the pizza man. >> reporter: dunn said he didn't realize anyone can be killed until late that night when he used his cell phone to look up information about the shootling. >> i ran to the bathroom and vomited. >> reporter: but he still didn't call police. he drove home to central florida

where he was later arrested. dunn was on the stand for more than three hours and he was the defense's final witness. >> all right, ladies and gentlemen, the defense has now rested their case. >> reporter: by late tomorrow, the jury should begin deliberating his fate. prosecutors want first degree murder, but many observers think that's a stretch. >> they've lost credibility by doing that. this is not a case of premeditated murder. he didn't know these kids ahead of time. he didn't go to the gas station in order to shoot them. they love to overcharge because it frightens defendants. it hurts them in trying to get out on bail. it sends the message to the public that this is really a vicious crime, but when they get to the trial, can they really prove it? >> reporter: that will be up to 12 jurors who will have michael dup dunn's own words fresh in his mind. >> reporter: i'm ryan owens for "nightline" in jacksonville, florida. >> and when that verdict comes

down, we'll report on it right here on abc news. and coming up next on "nightline," the young hollywood actress and the facebook message from a complete stranger that would change her life forever. did she find her long lost twin sister via social media? [ male announcer ] your eyes. even at a distance of 10 miles... the length of 146 football fields... they can see the light of a single candle. your eyes are amazing. look after them with centrum silver. multivitamins with lutein and vitamins a, c, and e to support healthy eyes and packed with key nutrients to support your heart and brain, too. centrum silver. for the most amazing parts of you. centrum silver. a steel cage: death match of midsize sedans. the volkswagen passat against all comers.

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>> samantha fuderman got a facebook message from a stranger that would change everything. the woman sending the message pointed out both she and samantha had been adopted and they looked very, very similar. could they fw long lost sisters? >> two young women are about to get news that could inexorably also alt altar their lives.

they're going to find out if they were identical twins separated at birth. >> it's a life changing thing whether you're twins or not. are you both ready? okay. >> samantha always knew she was adopted. >> i was born in korea and four months later i arrived at jfk airport where apparently all babies don't come from. and yeah, i met my family for the first time. she grew up in new jersey and later moved to los angeles to be an actor, and a working one at that. landing roles in films such as "memoirs of a geisha and "21 and over." >> do you know this guy? >> why? because i'm asian? oh, wait, i do know this guy. and like so many other 26 years old, sam has a profound online footprint and to that point often performs in comedy videos

she and her friends posted on youtube. a year ago, she received a very random message on facebook. >> the facebook request was weird. i thought it was a creepy fan of my friend or something. >> reporter: the request was sent by a stranger living 5,000 miles away. >> i am french and live in london. about two months ago my friend was watching one of your videos and he saw you and thought we looked really similar. like very really similar. >> reporter: that face looked for all the world like a reflection in her own mirror. and that began a journey for two women that now sought to uncover the answer to the only question that really mattered. were they twins? >> i don't want to be too lindsay lohan, but i was wondering where were you born? the possibility of however remote of playing a role in a real life parent trap proved understandably irresistible. >> we're like sisters.

>> sisters. >> we're, like, twins. >> anais was adopted as an infant by a family in france. >> oh, hey, this is my brother matt. >> reporter: her digital detective work intensified and she tracked down of samantha's youtube videos about being adopted. >> you're being ridiculous. you know what? you were adopted. what? i'm just kidding. i've always known that. >> a touch of hesitation, overwhelmed by massive mu kul cu -- mutual curiosity, they set up a time to chat. >> i am about to go on line to facebook and then skype and skype my potential twin sister, which is really crazy. >> reporter: the power of social networking rendering a vast world in an instant, a very strange and intimate place. >> my connection is really bad. >> oh, my god, you're european!

>> this is a really weird experience. >> this is so weird. >> i don't want to get my hopes up, but i think somewhere in the pit of my gut, i knew that it was probably true. >> anais. >> from there, a deepening friendship, talking almost daily and culminating in london with their first in-person meeting. >> first things that you said? >> i poked her head. >> to make sure she was real? >> was there a sense of relief that finally you could get that moment out of the way? and then just set about being together? >> yes and no. i think i wanted to live in that moment for a long time. >> reporter: that shared moment sparking so many more. there are visits to los angeles, travels back to south korea, and a reunion here in new york. each time believing just a bit

more. so how are you alike? >> same laugh. same shortness. >> hey! >> sorry. >> reporter: i am going to ask you a question. i want you to answer at the same time. >> coke or pepsi. >> coke. >> reporter: one pet peeve? >> shower curtain touches me. i hate that. >> oh, my god, that's the same. i hate that. >> reporter: despite the small similarities and the inarguable physical resemblance, sam and anais turn to dna testing and finally the answer is there. an answer they share with samantha's adoptive mother. >> i'm going out on a limb here. you're sisters, aren't you? >> yeah. >> holy [ bleep ]. >> did it make you feel good to know that you're identical twins? >> yes. i think it was a relief in a

way. even though we knew. but if there's a slight 1% chance we might not be. >> reporter: they decided to make a documentary. they're calling it twinsteres. hoping their experience inspires other adoptees on their own journeys. your necklace, what does it say? and the significance of them to you is what? >> it says best friends forever. and i got them for christmas because i never had them growing uh. >> it sounds really cheesy, but i think we need those little kids moments. and those cheesy moments together. >> the feeling on christmas, when you open up the present and it's the one you were asking for. that pure feeling of joy. >> reporter: well, now that you are together, has it changed the idea of the future for you now? >> i think i feel a lot more confident knowing. it's like yeah, i found my second half back. >> reporter: realiz --

>> realizing i have an i dent call twin sister, it dropped a bomb on me. everything and anything is possible in the world. now literally any doors open. >> reporter: i'm josh elliott in new york. >> our thanks to josh elliott for that great story. coming up next here on "nightline," how a russian billionaire came to the rescue of the stray dogs of sochi. [ male announcer ] this one goes out to all the allergy muddlers. you know who you are. you can part a crowd, without saying a word... if you have yet to master the quiet sneeze... you stash tissues like a squirrel stashes nuts... well muddlers, muddle no more. try zyrtec®. it gives you powerful allergy relief. and zyrtec® is different than claritin® because zyrtec® starts working at hour one on the first day you take it. claritin® doesn't start working until hour three. zyrtec®. love the air.

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>> one of the oldest events in the country just got a littleless stuffy. the westminster dog show opening up to mutts for the first time this year. some of the mixed breeds making that are debut -- a fuzzy pointy eared hound known as the portuguese podango pequino and the chinook, a rare breed of sled dog with more than one coat. no mutt made the cut. that's because they were only allowed to compete in one specific agility event. tonight, sporting, working and terrier breeds all clawed their

way to become finalists for top dog. the cardian welsh corgie didn't make it. neither did the portuguese water dog. a wire fox terrier can the name after all painting the sky. consider what is going on in sochi. a pet control company at the winter olympics was given the task of putting down 2,000 strays the director described as biological trash. but then a russian billionaire stepped in. he is one of russia's richest men and a dog lover. he donated money to rescue as many of the dogs as possible, saying that his own beloved first pet was also a stray. now even olympians are getting in on it. u.s. skier gus kenworthy tweeting puppy love is real to puppies. and for information on how you can adopt one of the stray dogs of sochi, go to our website, abc

news.com/"nightline" and good for you if you do that, by the way. thank you for watching "nightline." world news now is coming up soon. tune into gma first thing in the morning. as always, we're on line at abcnews.com.