i need to use the restroom. (line ringing) come on, raven, pick up. (phone buzzing) krumitz, why do you keep blowing up... raven, raven, stop talking, just listen. avery, tristan jenkins is the target. what? he was behind the wedial intrusion. he wouldn't say who was under e mask because it was him. come on. fbi! clear. fbi! clear! clear! this is special agent avery ryan. we have a suspect fleeing. tristan jenkins, five-foot-ten, caucasian, brown hair.

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tonight on your cbs 2 news -- standing united. the group gathering in cedar rapids today, sending a message to

paris. plus - sounds like the holidays. the three special guests ringing those familiar

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(indistinct radio chatter) isabel's apartment. everything tristan told me about his friendship with isabel he learned by eavesdropping on her wedial video chat. the painting, the chinese dinner... all that happened while she was video chatting with someone else. isabel: maybe i'll fly home and visit over the long weekend. it would be nice to spend a night in my old room. tristan:we liked the same chinese food. takeout tuesday. so weekends were movie marathons-- usually animated movies. ...skip the games and ask her out already. can't get the color of the ocean right. you'll look at the ocean... tristan: she loved painting. she introduced me to it. ...painting and you realize it's actually a million... this is like a cyber version of that movie rear window. but, so, they never actually met? the way he's profiling, no, not in the real world.

tristan's ptsd masked more serious behavior: technology facilitative social isolation. he basically lived his whole life in this apartment. that explains all the eggs we found in the refrigerator. probably wasn't getting enough vitamin d from the sun. sounds like agoraphobia. no. agoraphobia is an anxiety disorder-- a fear of being in a situation where you feel helpless or trapped. tristan's isolation was not born of fear, but of dependence. technology provided him with everything that he needed. he became addicted to experiencing the world online and over time, the only time he felt safe or comfortable was behind a computer screen. i bet the first time he saw isabel was when she moved into this apartment building. he used his wedial exploit to find her and then eavesdrop on her. what drove him to murder? primal urge. as his obsession grew, he overcameehis self-imposed i ilation. so he forced himself out his door,

into her apartment, carved her up while she video-chatted with her parents. it's looking that way. and if so, tristan didn't collapse because he witnessed a murder. he was overwhelmed by sensory overload when he committed murder and left this apartment. (phone chimes) all ght, text from russell. "our killer's saliva is not in any law enforcement database." well, that makes sense. if he hasn't left this place in years, he hasn't had the opportunity to commit a previous crime. can you grab one of t tstan jenkins' toothbrushes and get it to d.b. russell in the field office? look, a simple dna test should tell us if tristan's our killer. yeah, but with ten monitors? i mean, he's probably watching more than just isabel. we gotta find this guy quickck and put some cufuf on him. krumitz: just heard from raven. she's downloading tristan's computer. hey, man... you cool? yeah. you didn't eat the trout in the commissary, did you? no.

um... let me ask you a question. if you were given opportunity to help francine before she got in trouble, would you have? i'd have done anything to help her. anything. yeah. l right. ramirez: avery? i think i got something here. okay, i've been going through tristan's computer. i found online orders, mesesge board posts, nothing special, but then i found this. are we live? no. these are recordings. eight terabytes worth, over 100 hours of video. i'm thinking tristan captured every wedial sessionnthat came through his machine. wait a second. there's laughter, a birthday, a grandfather. these are all happy moments. so, tristan's doing what? cocoecting happy moments from his victims' lives?

tristan: my mom and dad are still married. my sister goes to florida. she's a junior. oh, my brother just had a baby. grandma died a few years ago, but he loved her so much. he can't even replace the glasses grandma bought him, no matter how many times they break. there's s generational mix. these people aren't his victims. they're his family. that's why i didn't read that tristan was lying. tristan so fully believes his delusion that he thinks he's telling the truth. ramirez: tristan thinks this collection of random strangers are his loved ones? to him, they aren't random strangers. they are his family. (phone buzzes) russll. okay, avery, i just got the dna results back from tristan's toothbrush. it's not a match to the saliva samples we got from the crime scene. he's not isabel's killer. all right, so tristan did not brave the outside world to kill isabel. but he knew that she was being murdered, because he was eavavdropping on her wedial session. he saw exactly what her parents saw.

he could to get her help without leaving his apartment. (dialing phone) man: 911. please state your emergency. he's stabbing her! please, help! help! and then when he realized the police were not gonna get there in time, he did the only thing he could. he overcame his fears and stepped outside to help. but if tristan's innocent, then, you know, why'd he run? ryan: you know, the last time we spoke, i think he might have recalled the killer's face. and now he's out for revenge. if you misplaced your discover card, you can now use freeze it to prevent new purchases

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i've made up my mind. he won't stop, soso have to stop him. i tried to excuse it, telling myself he was just overly affectionate, but it's sexual assault. i threatened to tell my father, but he wouldn't stop. so i told him i'm going to the police. ramirez: i found this video journal entry on isabel's computer.

there are no other videos lili this. she doesn't identify who she's talking about, or where the assault took place. why would she record it and then delete it? shame. changed her mind. but isabel had already threatened to go to the police. this was motive. the "he" that she talks about... was scared. whoever this person is, is her killer. (murderer grunting, isabel screaming) (grunting and screaming continue) recovered this from tristan jenkins' hard drive. i had to dig through hours of footage. this is what isabel's mother and father witnessed. krumitz: ununrtunately, this video doesn't actually help us i.d. our killer. okay, all right, uh, nelson, go back a few seconds, please. (video rewinding)

i really miss you guys. russell: right there. isolate that bracelet and highlight the engraving. it's the infinity symbol. what are you thinking? i'm thinking that we can run a facial recognition without a face you guys know about abbi stands for automated body and belongigis identification, right? so we all have articles of clothing we wear so often, they become unique identifiers, like our murderer's bracelet. well, this is great, but there's no random-s-sff-we-own databaseseo search. you know, actually there is, and that index happens to be public and linked directly to people's names. what is it? 350 million samples submitted evevy single day by the users themselves. friendagenda! pow! okay, crop out the unique characteristics of our killer. all right, then we write a script to crawl all friendagenda photos. and if isabel's murderer is like the rest of the world, he will have posted at least one photo that will lead us to him. 52 matches in the tampa area.

zilch. nelson: zero? the entire time i've worked here, i've never had a zero match. okay, okay, okay, well... (phone buzzing) wait a minute. russell: here we go. all right, so, social media sites like friendagenda-- they-theyeyink profiles of relatives like a family tree, right? krumitz: uh, yes, yeah. stay-stay with me. yeah, yeah. okay, when i analyzed the saliva samples that raven collected from the scene, the dna gave me, what? age, hair color, eye color, all of that stuff, but it also gave me evidce of an inheritablj genetic disease. where is it? right here. okay, so, our killer has a 50% chance of inheriting marfan syndrome. okay, well, let's see if any of our 52 results have a parent that belongs to a susuort group on friendagenda. right. krumitz: got two hits. bringing up the profile now. the one on the right's our murderer.

okay. what now? you could have given me the heads up, man. what are you talking about? talking about the fbi. they're raiding my firm right now. they won't even let us back in the building. you knew that this was gonna happen, brody, and you did nothing about it. but i guess blood and family doesn't mean much of anything to you now?! look, , at is not true, jordan. we're e ood, but it wasn't me that decided we weren't family. (phone beeps off) (siren blaring) georgia: you're sure this is everything? i think so. but if i find anything else isabel had here, i'i' mail it to you. she was my friend. get out! georgia: oh, my god! ple-please... please don't hurt us. gil, georgia, i didn't know you'd be here. do... do we know you?

no, no, no, i'm not... i'm not gonna hurt you. i'm just here for him. he killed her. what? what are you talking about? i remember. i finally remember it. saw your face when u took off the ski mask! neil, what the hell's he talking about? i don't know. she was my friend, and you took her from me. you killed my isabel. no. isishis true, neil? gil: look at me. georgia: oh, god. look at me, neil. oh, god, gil. gil: look at me! elevator's not working. tristan must have shut them down. he chained the statawell, too, locked us out. there should be an emergency ladder inside the elevator shaft. it's not opening. get the hydraulic spreader. i can try to hack the elevator, get in electronically. no, we don't have time for that. wewee gonna get to tristst the same way he got to isabel-- over the internet. please, you don't want to do this. yes, i do. you deserve to die for what you did. you tookoker from me. ryan: tristan, listen to me.

shut up! you don't know what she would have wanted! you didn't know her like i did! no one did. ryan: no, you're right. nobody knew her like you did. she shared all her secrets with you. but what about the rest of your family? your grandpa. your brother with the new baby. your sister in college. tristan, if you do this, you will lose them all forever. put the gun down, tristan. put it down and keep living for your family. that is what isabel would want. (crying) mundo: tristan jenkins, handndin the air! hands in the air, on the ground now! get on the ground!

(tristan whimpers, sobs) georgia: gil! gil! (sobbing): oh, my god. mundo: drop it. ryan: what's happening? (crying): oh, my god! gil! (georgia sobbing deeply, sobs echoing) mundnd(echoing): take him away. (echoing): emt, tampa capital, top floor. (indistinct radio transmission) wait... tristan. i didn't know gil was gonna be here. i was supposed to kill neil. me, not him. she's gone. she's gone, and i can never have her back. tristan... i don't even know if you can understand this, but you are gonna be brought up on charges, too. (siren whoops in distance)

isabel wouou have liked you. captioning sponsored by cbs and toyota captioned by media access group at wgbh access.wgbh.org ten - france strikes back.the latest on a bombing campaign under-way in syria. and - your thoughts on whether the s - should join france and declare war on isis - at ten sfx: laughing tracfone 90-day plans start as low as twenty bucks and give you minutes, text and data with unlilited carryover. that's ninety days of dashing through the holidays for less. america's largest and most dependable networks.

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right now on cbs 2 news-- fear in france. france."these murderers, this act of terrorism, it's an act against all of us"what caused a major scare today - (( nat jet?)) and how france - is wastingngno time - fighting back. then , "i thought that there would be extremist groups filling the vacuum"the democratic candidates come off a big debate night in des moines. their response to the paris attacks - and who the polls say won. won.and what to do about isis - " i'm really hoping we step up and actually do something ... .. i don't think we're at a point where we need to do something radical. " your thoughts on whether it's time - to declare war? war?now, the corridor's top stories and tomorrow's weather forecast in the first ten

minutes. this is cbs 2 news 10 at 10. tonight - the city of paris is still on edge - as france declares war - - and launches a bombing campaign - against - isis * - in syria. good evening. fighter jets began major air-strikes earlier today - destroying two - jihadi* sites - used for isis - training. training.the mood in paris - still very tense. earlier today - a crowd at a memorial site panicked, when someone thought they heard gunshots.it turned out to be a false alarm. french authorities are also beginning to piece together who is responsible for the attacks and is launching an agressive manhunt for several suspects. family members here in america who know some of the victims, are beginning to speak out. "both legs were hit, one bullet passed through her friend and hit her and then she was hit by another one. every time i ithink about it, i try to picture it, it just overwhelms me. i can't imagine what she must be going

imagine."the death toll from friday's attacks now stands at 132.at least 352 others are injured - many of them critically. this tragedy hits close to home for several people in cedar rapids - including one family in particular. members of the french* community - in the corridor - say - being thousands of miles away from home - - makes it even more difficult - to deal with the tragedy. tragedy.cbs 2 news reporter - steffi - lee - is here - to show us - how they gathered tonight - to find rength. imagine waiting for hours to see if your son was alive after realizing he was inside the paris soccer stadium - when the first terrorist set off an explosion. ttt's what brought one cedar rapids family out to tonight's silent vigil - they say he's safe, but know others need to heal. heal. "we weren't able to get a hold of him for a few hours. so i think the waiting was the hardest part."the luebe family says their son trevor

witnessed the chaos that shook this soccer stadium in paris. paris. "no one at the socr match knew what was going on - they thought it was just part of the game."he's studying abroad in paris - and is safe. but that doesn't stop the hurt here at home. home. "my heart aches for the people thahadidn't make it." it's what brought them to this silent memorial - a way the french communit in cedar rapids is standing solidarity with paris from thousands of miles away. away."when you're so far away, you feel like you don't have - you can't do anything, you cant help, you don't even know what's happening."the crowd of about 50 people - gathered to heal from anguish and grief as distance isn't making the tragedy easier to handle. handle. "the first thing you want to know - it's like everything else, you're under shock, and then i think there's a feeling of anger that develops."thoho here say it's okay to hurt. it's okay to ask why. why."you want to make sure you don't fall into generalization

s and hatred and we just hope