not so easy to bring a human heart to heal. [music playing] >> this is "dateline." >> he was definitely charismatic. >> he was the new kid. super popular. all about adventure. >> he just jumped right into the culture. >> he liked to show off a little bit. >> this had their vehicles broken into. >> osomeone had been sneaking into their home. >> i was sitting here panicking.

>> in a flash, it was over. >> the charismatic kid dead on the floor. >> it's terrible. i screamed for hours. >> what had happened in that garage that night? >> it was just like the last person that would come to me mind. >> a neighbor protecting his home oorl preparing a trap? >> it's show time. >> it's show time. >> we are all taken aback. >> was his death a case of homeowner protecting family and property, or something far more deliberate? here's josh with "deadly

exchange." >> it's a dilem that confir every teenager how to simultaneously fit in with your friends and rebel against everyone else? >> kids do dumb stuch all the time. >> sneak out of the house and just hang out or drink with other teenagers. usually teens sneak back home safely. this wasn't one of those times. >> i just couldn't believe it really. >> i was, like, it can't be, it can't be. >> it was april 2014 when two bright foreign exchange students living in montana snuck out of their home. >> he is barely breathing. >> just minutes later their amazing american adventure came

to a sudden and tragic end. >> where is he bleeding from? >> everywhere. >> i never knew someone would die over it. >> it was the worst thing that could have ever happened to us. >> it all began so differently formal. a dream come true. he was an exchange student from germany, excited to soak up anything and everything american. at 17 he landed in a special corner of the west. mozuma, montana. >> he was charismatic. >> dana, anna, and chance were three of darren's closest friends at big sky high school. >> he was way different than all of the other foreign exchange students that usually come. he was really outspoken and outgoing, and he just jumped into the culture.

>> and he was a terrific athlete. >> there was no secret that the teacher who recruited if darren to big sky also happened to be the sky's soccer coach. zplie think the guys were, like, he is kind of a bad ass, you know? >> stalky kid. like -- >> he was tough. for sure. he threw down. >> according to his friends darren's soccer skills and his good looks definitely helped him with the opposite sex. >> he was always talking do girls. >> a man of the world. >> other soccer players would say that he would never miss a chance to take his shirt off and run around the field because they knew that he was going to put on a show for them. >> he lived with his -- a hilly

subdivision of mozulla where. >> such a terrific kid. you could see that off the bat. >> he called you mom and dad? >> he really became our son. he did. there's no doubt about it. >> darren was more than just a fun kid. he was engaged in the world. this was not juror typical american teenager that wants to talk about, you know, sports stars and, you know, the latest fashion and -- >> no, not at all. >> somebody who thinks about the situation in ukraine. zplool by the end of the school year he had a solid circle of friends. he was friends with another exchange student. >> we had so many things in common. same wishes and dreams. >> they were a package deal zbloosh you see one, you're going to see the other? >> oh, yeah. >> saturday, april 26, 2014, was

no different. the boys spent the evening playing video games and elev listening to music in randy and kate's basement. >> they went down 10:30 or so that night, told them maybe crank the music volume down a little bit. >> but around midnight darren was bored, restless, and suggests that he and -- take a walk. >> i was kind of -- i am just really tired. come on. okay. >> so while kate and randy slept upstairs, robbie and darren slipped out the back door for a walk around the neighborhood. they headed up the nearby hill and then turned up deer canyon road. then robbie says darren suddenly walked off, and robbie lost sight of him. >> he continues walking. >> robbie says he called out to darren, but there was no answer, so he kept walking, figuring darren would catch up. >> that is when i heard someone

yelling there, i see you there, something like that. after that just the shots. like three or four shots. i just started crying. >> gunshots in a quiet residential neighborhood. a now terrified robbie ran back home. >> he is faster than i am. i thought he is probably coming. i was almost sure he was coming. >> but darren wouldn't return and what happened to the german exchange student would simultaneously make headlines around the world and get americans asking how far can you go to protect your home and family? coming up -- >> 911, what's your reporting? >> a robbery. >> an urgent call to 9 11. >> shots were fired. >> when "dateline" continues.

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in an unreasonably narrow fast food drive thru lane. but what a powerful life lesson. and don't worry i have everything handled. i already spoke to our allstate agent, and i know that we have accident forgiveness. which is so smart on your guy's part. like fact that they'll just... forgive you... four weeks without the car. okay, yup. good night. with accident forgiveness your rates won't go up just because of an accident. switching to allstate is worth it. sunday morning was less than an hour old, and the sound of gunshots ricochetted from the neighborhood in mizzoula, montana. >> what are you reporting? >> a robbery. >> okay. what's going on? >> um, somebody entered sbu our

garage, and shots were fired. >> a robbery -- a shooting was unheard of. dash cams captured the chaos as first responders raced to the scene. >> they heard the sirens. >> he came with me, and he was, like, where is darren? he said he didn't know. >> he didn't know? >> right. that was kind of weird. i looked in the rec room and didn't see darren and so i came back to him and said what's going on? where is darren? >> robbie fessed up. he and darren had sneaked out.

he told randy how darren had walked off on his own, and thn robbie said he heard gunshots. alarmed, randy woke up his wife and the three of them went to deer canyon road. -- >> the next street. >> there are some neighbors out? >> the neighbor's house. >> when they got there, he stopped them. >> we were just hoping darren would just walk out of somewhere and walk -- you know, go up and come out the door. >> saw a police officer. gave the name, the description. just wait here for a second. and then came back and said you need to go to the hospital and that it wasn't good.

we had just passed an ambulance, and he must have been in the ambulance. >> did robbie stumble into a burglary in process or a violent home invasion? the police asked robbie to answer some questions. >> it wasn't long after we got there that the e.r. doc came out and explained that his wounds were falts that and he was no longer alive. it was horrible. i went outside the hospital and just screamed. it was -- sorry. we went to identify his body, and it was horrific. his beautiful body no longer

complete. it was terrible. i screamed for hours. >> he would never make it to his 18th birthday. >> i thought it was a joke. i thought there's no way possible anything like this has remotely happened to me or, like, anything growing up, and so it was just -- it was obviously a shock. >> it was just like the last person that would come to my mind, i guess. >> darren's soccer coach assumed that whatever happened to his star player, it wasn't darren's fault. >> was he shot by another kid? downtown mizzoula and got in a scuffle? i didn't understand. >> police had concluded only one person was shot that night in that 911 call. >> who got shot? >> the robber. he is badly injured. >> okay. so they entered your garage and

who shot him? >> my husband. >> they could scarcely imagine -- he was the burglar. police were about to hear a story from the man holding the gun that night. a story of terror and a family under siege. >> and we've been sketched out. we don't feel safe. i'm on edge about everything. >> two frightened homeowners victimized two times before. what had happened inside that garage? coming up -- >> i was sitting there panicking, you know, like he is coming at me. >> when "dateline" continues.

a high school exchange

student from germany had been shot and killed during an apparent burglary inside a neighbor's garage in the quiet town of mizzoula, montana. now darren was dead, and police were investigating. >> does that happen a lot here? >> people shoot burglars who are in their homes? >> no. it doesn't. >> mizzoula police department detective guy baker had the case. soon he was interviewing the man who pulled the trigger. >> hi, marcus. i'm guy baker, a detective. >> karma, and his common law wife had just moved to mizzoula. they were looking for a quiet, safe, and kid-friendly place to raise their child. police spoke with janelle at the scene and recorded their talk wikarmat station. >> so we want to talk about what happened tonight at your house. >> the couple told investigators

the story actually began with a burglary three weeks earlier, and then just ten days after that burglars returned. >> somebody had trespassed in their vehicles and in their garage, which was unlocked. >> cash, credit cards, and a cell phone were taken. marcus karma said he feared they were being targeted. >> it sucks, and to know that we're being watched and targeted and knowing how hard it is for you guys to actually catch a burglar with no evidence. >> karma said they no longer felt safe in their own home and were terrified they would be robbed again. >> we've been sketched out. we don't feel safe. i'm on edge about everything. >> the couple even e-mailed their neighbors to warn them about the string of burglaries and to suggest everyone lock their cars and garages. >> it's a terrible feeling, and

it does leave people feeling violated and angry. >> yes. i would agree. >> that's not uncommon. for people to be upset and extremely vigilant after a burglary. >> i would agree. it's not. >> the more time that passed, the burglars at large, the more fearful marcus and janelle said they became. in part, because he was a seasonal firefighter and would have to travel for work soon, leaving mother and child alone for months. >> she was scared that marcus was going to be going off on a seasonal employment here soon. >> so karma told police his wife decided to put together a homemade security system that would warn them if another intruder showed up. >> it's got motion sensor one, he motion sensor two. >> she had placed a baby monitor on the east wall of the garage. >> a video baby monitor. >> once the alert sounded due to motion detector, then they can see what the baby monitor can

see. >> all of that was connected through a smartphone app so when the motion sensors were triggered, an alert would allow them to view live video of their garage. that saturday night karma said they were trying to relax after putting their son to bed. >> i had recorded the movie "lincoln." we were watching that. about one-third of the way through that, i'm not sure what the time was. it was dark outside. you know, we went outside and had a smoke in the garage like we always do. we would usually leave the garage door open to air it out. >> but five minutes later an alert from the motion sensors. someone was in the driveway. an intruder. perhaps the same one who had targeted them before. these photos are from the home security system. that's darren entering the garage. marcus karma said he grabbed a loaded shotgun he had for protection. >> i'm sitting there with the shotgun in my hand, and i was staring at the lock on the front

door, and i can't tell if it's locked or unlocked, and i'm starting to shaichke at that po. the adrenaline is coming. oh, my god, this guy came back to the house. >> karma said his wife stayed back while he went out the front door and turned towards the garage. >> a few quick steps around my front. saw where my truck was parked with my butt touching my grill bar. that's where i stood. then she flipped on the light. >> karma told the detectives he was blinded by the sudden light and realized the only way for the intruder to get away was to go past him. then -- heard something move, like a piece of metal hit the cement. either that or a piece of metal hit a piece of metal. it sounded like either a melgs -- a wrench being picked up or maybe the axes. >> marcus karma said he did the only thing he could to protect

himself. >> immediately i fired high up in the right corner of the garage. here i am looking at my garage. i think in total four rounds were shot. all directly one, two, three, four. >> if i live in montana, what right do i have to shoot someone who has entered my house? >> you have the right to use any force necessary in defense of yourself or no greater force. >> okay. this was a burglar who had broken in. you don't know who he is. you know it's somebody that you don't know, and they have crossed that invisible line from outdoors to indoors. they are by that definition alone i would say a threat to me. >> well, you got to be able to articulate the threat. >> and karma told investigators there was a real threat. the garage was full of tools the intruder could grab and use against him. >> i imaged an ax flying through the air and hitting me in the

skull. >> karma said he was positive he heard that scraping sound just moments before he fired the shotgun. >> i'm describing the sound when i say what i am picturing in my head is i'm going to die. >> to hear marcus karma tell it he faced down a threat. it was kill or be killed. that was justifiable homicide. the young soccer star, who was by now in the morgue, must have had a darker side that they didn't see. detectives decided to dig deeper into the loifz of darren and the man who shot him. what they learned was only deepen this mystery. >> coming up -- >> true or false, darren was committing a crime? >> he was. >> but was darren the only one breaking the law? >> it's, like, showtime. >> he says janelle make the statement it's show time. >> it's show time. >> exactly. >> there would be anger and

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i'm dara brown. evacuations remain in place for residents on hawaii's big island as the volcano continues to erupt following a pair of strong earthquakes. five homes have been burned by lava. rob mueller was questioned. barrack was questioned as part of the ongoing russia investigation and was asked extensively about paul man mana and rick gates. now back to "dateline." welcome back. homeowner marcus told police his story that he was living in a state of fear, but his answers raised more questions. what really happened in that garage, and what was darren doing there in the first place?

to find out the truth they needed to learn more about their german exchange student. here, again, is josh mankomanko with deadly exchange. >> exchange student darren was just two months away from returning to his family in germany when he was shot in a garage. the man who shot him said he feared for his life and for darren's best friend robbie, police learned the teen did enter the garage to steal. as robbie described it, darren was not the first kid in mizzoula to go sneaking into unlocked garages. he said the kids weren't after money, credit cards, or valuables. this stunt happened often enough that it had a name. garage hopping. the target was usually beer. >> the reason for garage hopping or garage shopping -- i've heard it called both -- was for kids to go in and look for alcoholic beverages that they could easily get or take. >> until this shooting, that sort of wasn't on anybody's

radar in law enforcement? >> no. i had not heard garage hopping. no. >> these three friends of darren's say they had never gone garage hopping, but they know all about it. >> you all know people who do it or have done? >> yeah where. >> they understand it's illegal. >> yeah. >> but it seemed harmless. >> yeah, exactly. i mean, it's just -- you're, like, hey, dude, this is a way for you to get some extra beer. you know, when you are on a saturday night. >> i mean, did you think to yourself, you know, oh, my god, we didn't realize how dangerous that could be. >> but no one knew. no one would ever, ever be, like, hey, don't walk into that garage. you don't know if someone will shoot you. >> robbie told police that darren had done it before, but never taken cash or valuable property. >> he wasn't a criminal. he was like a kid. he was a kid trying to have fun and fit in the group, doing what the other guys do. trying to be part of them. >> was it really that innocent?

>> true or false, darren was committing a crime? >> he was. >> entering somebody else's home, even their garage, that's a crime. >> yes. >> even if the door is open? >> yep. >> and if karma's life was threatened, he had the right to shoot. didn't he? but as police went over karma's story about what happened just before the confrontation, something stood out. karma was describing how his wife first noticed someone was approaching their garage. >> he was, like, show time. she's, like, i see something. >> she said janelle made the statement it's show time. >> it's show time. >> exactly. >> suggesting what? that they've been getting ready for this all night? >> that seemed like a very interesting statement to me. it's show time. >> it didn't seem to fit with someone claiming to be terrified in his own home. then karma told police he took his time going out to confront the intruder. >> i stood up off the couch and just kind of slowly walked over

towards the front door, and she's, like, hold on, hold on. >> all of which might make you wonder with all that time to think, why not just stay inse? lock the doors? call police? >> i tnk the easiest thing that could have been done is once they were aware someone was outside, being alerted by the phone, they call 911. >> and while karma said he feared for his life, police found no weapon, no ax or tool near darren's body. the teenager was unarmed. and another red flag. karma said he couldn't see into the garage, but cops talked to the doctors and treated darren and they examined the shotgun pellet patterns on the garage wall. >> he said he can't see anything. yet, he is able to track a moving person in the garage, and he hits them two out of four times. >> one, two, three, four. >> i didn't believe that he is

just randomly shooting from right to left. >> so you are thinking to yourself this does not look like ae justifiable shooting? >> no, at this point it's looking like we have a homicide. >> the county attorney's office agreed. detective baker dlielivered the news. >> so we just talked to the prosecutor, and she wants you to be taken into custody, so that's what's going to happen. >> for what? >> for homicide. >> what? >> seemingly stunned, karma borrowed the detective's phone to call janelle. >> i'm being charged with murder. no. how is that deliberate homicide? >> that's how the statute reads. >> he seems surprised. >> he was surprised, and he was very emotional at that point. that's the most i saw marcus be emotional during this whole investigation. >> darren's host parents had a tangle of emotions as they

processed what police said had happened. >> not the kid we knew. wendt expect that. >> they were disappointed with darren's actions, but livid with karma's. >> i just got more angry and more angry that that happened. who thinks like that? >> just why? it was the why at that point. why would someone feel compelled to do this? >> mashus karma faces a deliberate homicide charge for killing a 17-year-old german exchange student. >> many were outraged that a homeowner could be arrested for defending his family and property. catherine hockey is a crime reporter at the local mizzoulian. >> some people were, like, of course, i could shoot somebody in my home, and that was definitely in the very beginning of the case. i received a lot of angry phone calls from people, a lot of people were afraid that this would intrude on their own rights to protect their home with a gun and their own gun

rights. >> the german press also followed the story closely. their take echoed the thoughts of many in this country. that darren was the victim of an american cowboy culture that glorifies gun violence. >> they were really incredulous that somebody could shoot somebody for coming into their house. they didn't understand how that worked in montana. >> but this is america. not germany. aren't you allowed to protect yourself? your home? your family? was even that on trial now? dogma and karma were about to collide. coming up, battle lines are drawn, and the revealing recording. >> then i heard the kids yelling. no, no, no, no, no, please. >> did darren plead for his life? when "dateline" continues. ♪

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death marcus karma went on trial for his murder. seeking justice for their son, darren's parents traveled from germany to a montana courtroom where they were befriended by the same group of kids who had loved their boy. >> a lot of us got the chance to meet his parents when they came, and they were really, really awesome. they were a lot like darren. >> his parents watched as the man who shot their son faced the charge of deliberate homicide. the karma's defense team led by attorney paul ryan, that was outright excessive. >> it was a man who was fearful. >> ryan laid out a basic narrative. marcus karma, twice a victim of burglars, reasonably thought darren was another one. and dangerous. >>. >> he thought he was dealing with a drug-teeking type individuals that were erratic and who knows how are they going

to respond? >> he told the juror his clients had reason to believe darren was armed and ready to attack. >> because he felt his life was threatened by the movement specifically of darren, he had to take the steps, unfortunately, to take his life. >> danger of a burglar is when there's a confrontation, and they all want to escape and do whatever they can to get away. >> the defense said there was no debate over one central fact. darren went into that garage to steal. on the stand karma's lawyer got darren's frent e friend, robbie, to admit that despite warnings, darren didn't see much wrong with garage hopping. >> i think darren never felt like it was a crime. >> but you were warning him and telling him it wasn't right. it was reckless and dangerous, right? >> yeah. yeah. like i understand on this way, but maybe he didn't understand. >> in fact, the defense suggested that darren was part of a local burglary ring that was stealing more than just beer

and may have been behind the previous break-ins at the karma house. >> they all knew each other. they awe went to big sky. >> the police never really investigated those burglaries at karma's house, and with no arrests his cliept wnt was lefta fearful, agitated state. the psychiatrist who examined karma diagnosed it as high magnitude stress. >> your body changes dramatically with how you react to things. fight or flight. while some people may have retreated, he came forward and confronted the individual. >> his body went into fight mode. >> the defense said karma felt threatened in his home and was within his legal rights to shoot under something called the castle doctrine. >> the legislature was made decisions that it should be easier to protect yourself in your house. you may or may not like the

castle law. you never asked you to like the law, and the judge says he doesn't either, but you have to follow the law. >> the defense insisted that marcus karma was guilty of nothing more than protecting his family. >> this is your house. the defendant was in your house as you choose to defend it. >> by the time the defense rested, those closest to darren thought that marcus karma's lawyers had redefined what this case was about. >> darren got lost in all of this, didn't it? >> a lot of the stuff i heard and read made him sound like some sort of just, like, foreigner who came here to stir the pot and make trouble. >> the fact is the defendant was angry and very longful.

he knew there was a kid coming in his garage. he had a .12 gauge in his hands, and he waits. >> to counter the defense's suggestion to suggest that darren was a ring of thieves targeting marcus karma, investigators tracked down the tooenl teens who had hit karma's garage. the ones who took the cash, credit cards, and -- >> he had a big bong and a jar of weed and some alcohol. >> did you know a man named darren? >> not personally, no. >> to the best of your knowledge, was he involved in a burglary ring? >> no. >> so did karma really fear for his life that night? prosecutors said ballistics told the story. the first shot to hit darren was to the back of his left arm, meaning he couldn't have been charging towards marcus karma. zhoo then he has to do it one more time. he has to make that final blow. >> and the final shot was straight to the head.

but prosecutors weren't done. they had what they thought was explosive evidence. just before the trial began, a recording surfaced, made the night of the shooting, of the conversation an officer at the scene had with janelle. in it she reveals that just before the final shot she heard darren beg for his life. >> then i heard the kid yelling no, no, no, no, please. then by then there was already a shot fired. >> and the prosecution said that after the shooting karma sounded like a man who was proud of himself. >> there had been an article on-line already, and the comments are all in your favor. >> really? >> this is a jailhouse phone call between karma and his wife talking about the news coverage. >> why is he being charged? this is [ bleep ]. why did he get arrested? >> tomorrow morning will you buy 100 copies or something of the paper? >> what did you say, hon?

>> record the local news tonight on tv and keep the newspapers from tomorrow. >> and he seemed to be very proud of that fact versus remorseful. >> but was this premeditated murder? the only other witness to the shooting was about to tell her story. >> coming up, a purse left as bait? >> the purse was for them to take. >> and one more revelation. >> he said he had been setting up for three nights with a shotgun. >> a hairstylist is about to provide the most hair-raising testimony of all. when "dateline" continues. from nexgard. nexgard kills fleas and ticks all month long. and it comes in an easy-to-give tasty chew. and that makes dogs and owners happy. no wonder vets love it too. reported side effects include vomiting, itching, diarrhea, lethargy and lack of appetite. see your vet for more information on flea and tick protection

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welcome back to "dateline." markus kaarma's defense tried to paint a picture of a man exercising his rights when he shot an unarmed teenager. now it was the prosecution's turn to convince the jury that he was a man bent on revenge and they had witnesses they thought could show him in a new light. here's josh mankiewicz with the conclusion of "deadly exchange." >> reporter: markus kaarma was on trial for killing an unarmed teenager in his garage. the prosecution was about to argue that not only was the shooting unjustified, it was planned, premeditated murder. to prove it, they put the defendant's wife, janelle pflager, on the stand as a reluctant key witness. she told the jury the same thing

she and the defendant had said all along. they were living in fear of intruders. >> literally every day i was like a paranoid person. i was looking over my shoulder all the time and very worried all the time. >> reporter: so then, why did they leave their garage door wide open on the day of the shooting? especially after they'd warned their neighbors to keep their garages locked? janelle said they smoked cigarettes in the garage, and wanted to air it out. >> i believe that it would be my right to have my garage door open to air out for a few minutes at a time especially when i'm there. >> reporter: the prosecution argued that janelle and her husband left the garage door open on purpose because they were setting a trap. janelle denied it but admitted, she deliberately left a purse in the garage with items in it that could be traced back to her. the prosecution said that was bait. >> you wanted to catch him.

that's why you got the purse. >> the purse was for them to take so they didn't come into the house and so that when i called the police and i say here is something traceable. >> reporter: so an open door, and a purse in plain sight. the prosecutor said janelle and her husband set the stage, then waited and watched. so when diren walked in, they weren't scared, they were excited. >> she's like, show time. >> reporter: on the stand, janelle denied saying those words. >> do you remember saying, "showtime," when you saw somebody outside? >> no, i don't remember saying that. it's not usually a common phrase that i use. >> reporter: in court, janelle also changed her story about what she heard in the garage that night, now denying that diren had been pleading for his life. >> then i heard the kid yelling, "no, no, no, no, no! please!" >> my question was, your

testimony here today is that you never heard him say a word. >> right. >> i sort of get the feeling janelle didn't do you a lot of favors on the witness stand. >> no, she didn't. >> she, you know, denied saying something that could be played on tape. >> right. yeah, janelle talks a lot. and you know, as a defense attorney, that often doesn't work out very well. >> reporter: janelle was never charged in the case. >> why wasn't janelle charged in this? >> in her statement to the officers, she wanted to catch the burglars. she wanted to identify them. >> reporter: prosecutors say they had no evidence that janelle knew her husband was going to harm someone. so what exactly was markus kaarma thinking? prosecutors brought in two witnesses to support the argument that the shooting was nothing short of a planned execution. >> he said he'd been sitting up for three nights with a shotgun, waiting to kill some f'ing kids. >> she works in the salon where markus karma got his hair cut

just days before the shooting. the woman said kaarma came in ranting about his recent burglaries, and his chilling plan to fix them. >> i did say to him oh, my gosh, you know, have you called the police? and he said the [ bleep ] police will not do anything about it. and then he had mentioned that he wouldn't mind if a couple did come by because he wouldn't mind shooting a couple of them also. >> her co-worker told the jury she heard it, too. >> he was going to kill them. take care of it. >> did he use those words, "take care of it"? >> i think it was, "fix it." >> do you recall him saying anything else? >> he said, "i'm not kidding. you will seriously see this on the news." >> say that one more time. >> "i'm not kidding. you're seriously going to see this on the news." >> it's intent to kill, right? he's announcing it. >> he's lying in wait. >> and he's telling them, "you wait and see, you're going to see this on the news." >> that's a defense attorney's nightmare, is testimony that your client told somebody else, "i'm going to commit this

crime," and then they're later charged with that crime. >> correct. >> reporter: as the trial came to an end, diren's friends gathered to support his visiting parents. >> there was a huge group of kids who went to the closing statements. so we went to support them on those last days. we filled up the stands with -- or the -- the seats with i don't know how many kids. >> a tree in front of our house became, essentially, the memorial for -- for diren. and more and more things showed up that -- so we felt more and more loved by missoula than we probably ever have. you know, just because they were trying to show support for us. >> reporter: but jurors had to consider the law and nothing else. here's how the prosecution laid it out. >> the issue in this case, what the defendant believed at the time he shot and killed diren dede. was that belief reasonable? and was the deadly force used necessary? that's your issue. >> jurors went to deliberate.

and after eight hours over two days, they returned to court. >> we the jury, all of our number, find the defendant, markus hendrik kaarma, guilty. >> reporter: the courtroom erupted in applause and tears. and while they say the verdict was a relief, diren's host parents still feel the raw pain of his death. >> nothing brings diren back. and so it's still -- it's just heartbreaking that someone felt compelled to do this. >> would you be host to another foreign exchange student? >> no. my -- my heart's too broken. i couldn't do it. >> reporter: two months after the verdict, markus kaarma addressed diren dede's family at the sentencing hearing. >> i took another man's life and i'm sorry, i can't change that. i did what i felt was necessary to protect my family and myself. and i hope that no one ever

finds themself in the position that i was put into. >> reporter: the judge sentenced him to 70 years in prison. >> i almost wish he never said sorry. because it was so empty and his face had just no expression. it was, like, scary almost. we were all like taken aback. i was like take it back. there was no meaning in that. >> reporter: and they say garage hopping is no longer popular. >> have attitudes changed about all of that since then? >> of course. >> yeah. i haven't heard a thing about it since. >> it's unheard of. >> yeah. >> reporter: diren's friends hope that people will forget the one deadly mistake diren made, and remember the bright, charming guy they loved. >> you know, you're all pretty young to have to go through this. you feel like this has changed you? >> yeah. >> one hundred percent. yeah, every day you wake up, you think, obviously, something like that could happen and you need

to, like, do things that matter. >> life seem a little more precious now? >> uh-huh. >> he's encouraging us to do a lot of things. and i think he's still pushing us. >> that's all for this edition of "dateline." i'm craig melvin. thank you for watching. i'm craig melvin. i'm natalie morales. and this is "dateline." she was a married mother two of. >> there was nothing about her life that would raise any red flags. >> she amazed them all. her whole group of girlfriends at the gym. >> she was totally dedicated. >> heather, turn around. you've gotten smaller. >> a stunning 200-pound weight loss. and a whole new life came with it. >> you could see that transformation. you could see the confidence in her. >> then, she was gone. missing at school. >> i called all the girlie