rid icu-lis. >> and the cnn special report "murder at the marathon" starts right. >> the following is a cnn special report. >> this is what they did in boston. >> oh, my god. >> but where did they go? >> less than a half an hour after they did this, they are thinking about what kind of milk to buy. >> where did they go? and what drove them to kill?

>> you saw the victims bleeding and broken. now the side of the story you didn't see. >> oh, my goodness, officer down. >> get on it! >> tonight, "murder at the marathon." >> april 15th, 2013. patriots day. a massachusetts tradition. >> you talk to anyone from boston and they talk about patriots day, the weekend to be in boston. it is our signature day and it is unique to boston. >> the centerpiece of the day is the city's world famous marathon. >> it was a chilly morning. 30 degrees. unlike when it was 80 degrees so we thought the weather won't be a story this year. what will be the story. >> the journalist steve silva is

covering the story for boston.com. >> it was a normal day and a good day. >> sidney corkran with her mom and dad are among the 1 million spectators enjoying the day. >> my family and i went into boston and got a bite to eat and made our way down to the finish line. >> 30,000 runners had spent months preparing to cross this line. >> opposite boston across the charles river, pro brothers are also preparing for the marathon in a much more sinister way. tamerlan tsarnaev and husband younger brother dzokhar live in an unremarkable house in an unremarkable street. they've been working on something from a magazine from a guide from the arabian peninsula. the recipe, make a bomb in the

kitchen of your mom. the ingredients are surprisingly simple. ordinary objects you can buy in everyday stores like pressure cookers, the kind you might use to make dinner. records indicate the pressure cookers are bought here at this macy's in saug us, massachusetts. a middle class community, about 13 miles from the tsarnaev's home. >> in late march, just two weeks before the attack on the marathon, one of the bomber's comes to this home depot, north of came bridge, to buy a soldering gun. >> it is used to heat metal and connect wires. the brothers buy fireworks to extract the explosive powder inside. that goes into the pressure cooker along with bb pellets and nails. home made shrapnel intended to tear flesh and shatter bone.

it is 2:37 p.m., about 4.5 hours since the race and when a majority of the runners are finishing. it is also go-time for the brothers. who round the corner on to the marathon route. their attack is timed to cause maximum damage. >> i always think of the families that just line that finish line. sometimes ten deep. and it is difficult to get by. >> that is where tamerlan positions himself. high school student sidney corkran is to his left. >> it was a great vibe. everyone was just being nice and cheering them on like, you can do it, keep going. >> dzokhar stops behind several families with small children, including the richards, with

11-year-old henry, 6 jeerld jane and 12-year-old martin. and now dzokhar raises a phone to his ear. the plan is now in motion. >> what the hell was that? >> tamerlan detonates the first bomb. >> oh, my god, something blew up. >> in the ensuing chaos, dzokhar walks quickly away from his backpack. he leaves it on the ground, right near 8-year-old martin richard. behind the richards in a blue sweater is 23-year-old lingzi lieu. >> she walked into frame just before the bomb goes off. you see he turn to look toward the finish line where the first

bomb went off and then you see her continuing to walk across the frame and then the second bomb goes off. >> the blast levels spectators and separates families. >> my mind always goes to the richard family. bill richard who saw the first bomb go off and thought i need to get my family here, trying to jump over the fence when the second bomb went off right over his family. you see him grab his oldest son henry and then you see jane and she gets up, not realizing she doesn't have a leg and her gather grabbed her and brings her to the pavement on the road to see if he could find emergency personnel and see him run back to where his wife and his son martin are. he said it was one of those situations where he had to tell

himself, martin is gone. i need to focus on jane. jane needs my help right now. >> it has to make the worst decision any parent has to make. >> and this picture of ling zi lou, the last one of her alive. a piece of metal from the pressure cooker slices her leg open. she bleeds to death on the sidewalk. >> i don't remember going down on the ground, but i remember kind of -- i know coming to and seeing everyone around me and i remember massive amounts of pressure being put on my leg and it was very painful. >> like ling zi lou a severed artery in her right thigh and she is losing blood fast. and near her leslie campbell is

bleeding profusely. my legs hurt. they are the last words crystal will ever speak. >> karen waters, she lost her leg and fell with her friend krystle campbell. she kind of inched toward crystal and placed their faces almost next to each other and then put her hand in crystal's so the last sensation that crystal would have felt beside the searing pain in her legs from the bomb would have been the warmth of karen's face and the embrace of her hand. >> one friend lives, the other dies. hundreds are left struggling to survive. and authorities are already trying to figure out who did this? how many are out there? and where are they now? coming up -- a cold-hearted killer seemingly without a care in the world.

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the marathon bombs kill three people. 29-year-old krystle campbell, described by her brother as the heart of her family.

ling lingzi lu, the chinese exchange student who planned to stay home to study. and 8-year-old who loved sports, including running. [ yelling ] >> something blew up. >> more than 200 people are shredded or broken. lives hang in the balance. one of them is sydney corkran. >> i remember feeling the blood just, like, come out of my leg and it was warm all over. and i thought, like, i'm bleeding out. like, i'm not going to make it to the hospital. >> as doctors rushed to save lives, at least one of the

bombers is here -- that is 19-year-old dzokhar tsarnaev, casually shopping at the whole foods in cambridge. it is 3:14 p.m., just 24 minutes after the bombing. >> he goes in and picks out half a gallon of milk. and the video shows him go back into the parking lot but the millm wasn't the right millm so he gets out, less than half an hour after they killed three people, he's back in there exchanging the milk because apparently it wasn't the right milk. it was an extraordinary thing to watch. >> and it also appears perfectly normal which is how friends who know dzokhar before the bombing describe him. >> he was a normal kid. carry on a conversation. make you laugh. he was fun. he was happy-go-lucky. >> dzokhar tsarnaev arrives in

the united states in 2002. an 8-year-old, speaking little english. his family is chechen, an ethnic majority long persecuted. >> his parents came and his mother and father and dzokhar when he was little. three kids were back home in kazakhstan. >> by the time older sibltings arrive the following year, dzokhar is fitting into american culture. by high school, he's a popular guy. >> he had a big cross-section of friends. most of whom were shocked when this came out, that he was charged with the boston marathon bombing. >> including these young men from his high school wrestling team who asked not to be identified. >> in wrestling he was a really nice kid. he was the kind of kid who would

push me hard and he was new to wrestling and so he would push me hard. >> by senior year he is wrestling captain and working as a lifeguard at harvard and getting solid grades and speaks english perfectly with no accent. if he is harboring any anti-american feelings, his friends don't have a clue. >> he never hated american. he just tried to be a typical american boy. >> a typical american boy who smoked a lot of pot. >> i was talking to some kids from [ inaudible ] and two mentioned he likes to smoke a bone. is that unusual in american high school kids? probably not. particularly in a city like cambridge. >> brother tamerlan, seven years older than dzokhar, is having a harder time adjusting but he is trying to find his place. >> he loved boxing. it was his passion. it was his outlet. clearly he wanted to be a world

champ one day. >> his high school buddy louise vasquez said his friend's ambition caused some of his problems. >> he could be intimidating because people knew he was a boxer and he had more of a reserved personality to him but if you went up to him, he would talk to you right back. >> ahead, what would cause an aspiring boxer and popular high school wrestler to do this? and this? and this? >> oh, my goodness. all units respond. officer down! officer down! all units! get on it! scott: appears buster's been busy.

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this is where tamerlan tsarnaev feels most at home. in the boxing ring. he's dominant, imposing, successful. john allen owns the gym where tamerlan trained. >> how would you describe tamerlan's skill as a fighter? >> very good. he was a proficient boxer. >> so talented he wins the new england golden gloves

championship twice. a step closer to his dream at fighting at the international level. >> it was his life's choice to use boxing to get nationalized to compete in the olympics. >> but then a sharp blow. he's bars from national competition because tamerlan tsarnaev is not an american citizen. >> that would have been just more box for him to check off in his sense of grievance. >> for tamerlan it is a familiar message. he is an outsider. that same year he tells a local photo journalist, i don't have a single american friend. i don't understand them. >> the older brother had a lot of problems. he wasn't able to assimilate to the u.s. culture like his little brother. >> his little brother, dzokhar. >> very well adapted and very personab personable, very popular within his school. >> he seems to be doing well.

>> he received a scholarship to go to college. a wrestler. all of those kind of things. >> but the rest of the tsarnaev family is struggling. the sisters with failed marriages, the parents with earning a living. >> they had all sorts of opportunity in this country, but by my measure they seemed to have not fulfilled certainly what their expectations were. >> money is tight and the family relies on welfare to get by. >> they had a common expense like chechens, living in common societies. >> the family homeland is chechen, the family violent and like many living far from home and that can create issues. >> issues of nationalism, and chechen and the jihadi groups over there and issues that have to do with assimilation and the

sense of belonging. >> tamerlan finds a sense of belonging in radical islam. >> he definitely started to talk about religion more. he would engage with people in the gym, talk about jewish con spearancies and grew a beard. >> they talk with his mother after receiving a vague and unusual warning. russian counterparts say they are an adherence of radical islam but the case is closed for lack of adherence. and by 2012 the marriage has fallen apart. >> a metaphor for the whole family has collapsed. a metaphor under all sorts of dysfunction and anger. >> as both parents separately move back to dagga stan, dzokhar is left to fend for himself at dartmouth. >> while tamerlan is becoming dehout, dzokhar is hanging out

with his friends and talking on facebook. >> >> i want to study abroad or two. i'm doing laundry at this time. #college. and he's also smoking and dealing plenty of pot. >> everybody knew this kid had -- the kid with the funny name, he always had pot. >> and his grades are plummeting as he takes a long trip to dagga stab. like neighboring chechnya, it is plaguing with extremism and here something happened. >> there is something that happened. people that he met. there were mosques that he attended. there were training camps possibly that he went to and probably received some training. >> tamerlan seems eager to share what he is learning.

e-mailing dzokhar e-mail links and writing, watching this, it's interesting. or ideas, quote, those who helps ala's cause will help them. and this one about martyrdom. and six months later when he returned to cambridge, he is radically different. >> even among mainstream muslims in the cambridge area, he stood out as someone who is more radicalized or angry. >> dzokhar becomes a u.s. citizen on september 12th but still has strong ties to his chechen roots. >> the fact that they both believe they are from chechnya and not the united states where they live. >> they are spending more time together and listening to radical islamist messages.

>> you should see it as a muslim, i'm one year closer to my death. did i prepare it for my death. a muslim cannot afford to waste any time. >> three days before the marathon. >> tamerlan and dzokhar stop at this mosque to pray. then go from worship to workout at john allen's gym. >> were you surprised at his demeanor 72 hours before those bombs at the marathon? >> unbelievable. just him entering the ring, i mean, you know, jumping over both legs, feet at his shoulder height, clearing the ring, popping in, jumping rope, like he was on top of the world. >> on top of the world and ready to act. that same week dzokhar tweets, if you have the knowledge and the inspiration, all that is left is to take action. >> april 15th, 2013, marathon

monday. the two brothers take their respective positions. set off two bombs on boylston street, and calmly walk away. coming up next, brothers on the run. an extraordinary manhunt in the city of boston. >> i actually saw a spark from the bomb and that is when i immediately hit the ground. i hate cleaning the gutters. have you touched the stuff? it's evil. and ladders... awwwwwww!!!!! they have all those warnings on them. might as well say, "you're going to die, jeff". you hired someone to clean the gutters? not just someone. someone from angie's list. but we're not members. we don't have to be to use their new snapfix feature. angie's list helped me find a highly rated service provider to do the work at a fair price. come see what the new angie's list can do for you.

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university of massachusetts, dort mouth. on campus a day later, everyone is talking about what happened at the marathon. >> we talked about the bombing for like about five minutes. >> everyone, including dzokhar tsarnaev and classmated zack betancourt. >> he seemed nonchalant. i haven't been doing much lately so i decided to head to the gym. >> as he heads to the gym, copley square is a crime scene and detectives sift through the debris. they find part of the pressure cookers and the backpacks and the fuse. fbi specialists are pouring over surveillance footage. >> we watched that footage

hundreds and hundreds of times to detect any anomalies or suspicious activities. >> like this, the man in the white hat whoar the first blast doesn't even flinch. >> so it was the absence of reaction. >> your normal reaction, if you hear a loud noise, you swift your direction and he wasn't phased and that stood out. >> we started to retrace and back this up. do we see him with anyone else and then we do. we see him with an individual wearing a black cap. >> investigators believe they have identified their suspects, but they don't have their names. >> we are releasing photos of these two suspects. they are identified as suspect one and suspect two. >> the two brothers are now the most wanted fugitives in america. >> they knew with the photos out there they were going to be

identified quickly. >> after months of carefully planning their attack, the tsarnaev brothers have failed to plan their escape. >> it was obvious that the two brothers had little idea or plans on what they would do next. >> dzokhar texts his friends, if you want you can go to my room and take what is there. >> as reality hits his friends grab his lap tap and fireworks which later turn oup in a landfill. >> i think with just the videos and photos they could have successfully fled immediately following the bombing. >> but they are definitely running now. >> so within days of the act they are committing other criminal acts to essentially make their getaway. >> the brothers only have one gun. and in search of another they confront m.i.t. police officer sean collier. >> he drives up in his police

cruiser and parks there. and you see these two images in dark and they come walking quite deliberately down this pathway. >> after a struggle, collier is shot multiple times at close range. the brothers run from the scene. >> all units respond. officer down, officer down! >> they killed him and murdered him in cold blood and then tried to take his weapon but his holster was designed to prevent someone from stealing his weapon, particularly in a struggle or something like that. >> across the charles river a few miles away they come upon an idling suv and decide to carjack the vehicle and the driver, 26-year-old chinese app developer dung mention. >> they said do you know about the boston marathon bombing? they said i did that. i just kills a policeman. so don't do anything stupid.

>> the brother question mention about new york city, use his bank kartd to withdraw $800 in cash and stop for cash. dzokhar heads into the store for snacks. >> they went inside of the shell gas station and it shows him getting a bunch of doritos and red bull which you would get for a road trip. >> alone in the car with tamerlan, he knows it is now or never. in a single motion he slips off his seat belt and opens the door, bolting across the street to a gas station to call 911. >> what happened when they took your car? >> they -- [ inaudible ]. >> the plan is unraveling. tamerlan races to get his brother. >> mention's escape gives investigators the break they desperately need. >> the one thing that dung mention did that was actually quite brilliant, when tamerlan asked if he had a gps in there

he said no, but in fact, he did. >> the police track the car to watertown, where the brothers engage them in a massive fire fight. >> i heard pops outside and i ran to the window and i just saw two shooters behind a vehicle, behind an suv. >> andrew kitsenberg takes these videos from his upstairs video. >> while they were firing at him, they saw tamerlan throw bombs at them and they saw pressure bombs like the ones left at boylston street, and this one he hurled at them, they were so heavy. >> and i saw sparks from the bomb, it was so heavy. >> they are in a fight for their lives. >> and they were charging the officers, running down the

street, firing their weapon. >> and they are literally ten feet away from each other exchanging gunfire. >> and then he runs out of ammunition. >> the bad guy. >> the bad guy, tamerlan, and then officers tackle him to the ground. >> when dzokhar saw what was happening with his brother. he jumps into the mercedes suv and come back at the cops with his brother. >> dzokhar aims the car straight at the officers. >> somebody yells get out of the way. >> they dove out of the way. >> instead he runs over his brother. >> the fatal injuries on his brother were inflicted by dzokhar who ran over his brother. >> dzokhar tsarnaev makes his escape. he is wounded and bleeding and blocking for a place to hide. >> coming up next, a city on lockdown. >> we're asking people to shelter in place. in other words to stay indoors with their doors locked.

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boston. a city attacked and left wounded and bleeding is now a city on lockdown. >> wow! get out of here. >> after a vicious fire fight with police in watertown, one brother is dead, the other is on the run. there is a big concern because he's got explosives on him. if this guy comes out, then he may come out and go down in a blaze of glory. >> there is a massive manhunt underway. we're asking people to shelter in place, to stay indoors. >> the stolen suv is found abandoned blocked from the shootout. inside it, an important clue. >> we knew we had hit him

because there was blood in that vehicle. and we started the grid search and found some blood behind a house so we knew he was wounded. >> but his bloody trail vanishs. tactical teams set up a 20-block search radius. terrified residents are terrified as teams search block by block, house by house. >> we had reason to believe he was still in the area but were never 100% sure of that. >> hours pass with no leads. where is he? is he alive? will he kill again? >> we didn't know whether we would be able to apprehend him. we were going to continue until we found him. >> at 6:00 friday evening the 12-hour lockdown is temporarily lifted. people cautiously leave their homes. david hennen berry goes into his

backyard to secure a loose flap covering his boat. >> and i look over the boat on the floor and i see blood. >> very quickly, that boat and that whole general area was surrounded by heavily armed police. >> you could hear the gunshots and we see a lot of activities. >> you have hundreds of law enforcement officers who zeroed in on a man they believe is the suspect. >> police surrounding the boat, briefly open fire. >> we were able to state police helicopter over the boat. and with the infrared, they were able to give information. they moved his left arm. his left leg just moved. >> [ inaudible ]. >> at 8:30 p.m. dzokhar is at a

standoff as they try to coax him out. >> he's coming out, he's coming out. >> at 8:45 p.m., dzokhar, bleeding and shaking, surrenders. a red laider from a sniper's rifle trained tren his eyes. >> we had every reason to believe he was armed in that boat. what was he going to try to do? >> with both hands raised, dzokhar is finally taken down. ending one of the biggest manhunts in u.s. history. [ sirens ] >> gravely wounded by gunshots, dzokhar is taken to a boston hospital. >> the suspect is in critical but stable condition. he's not in a condition to be interrogated at this point in time. >> the motive behind the horrific bombings comes into focus when a bomb technician

searching for explosives finds a crude note scrolls on the inside of the boat, now riddled with bullets and stained with blood is dzokhar's fan festo. the u.s. government is killing our innocent civilians. i can't stand to see such evil go unpunished. >> this is political. this is against americans because of what they did in iraq, against americans because of what they did in afghanistan, it has nothing to do with religion it seems. >> in his young mind he probably thinks it has everything to do with religion. so you have these mixed up notions about what is going on in the different conflict zones around the world combined with a superficial knowledge of his own religion doctrine and doug ma. >> he writes, we muslim are one body, he hurt one, you hurt us all. >> you read the note on the boat

where he was captured and it was clear wherever he got this information, he internalized it to such a point where he could lie in a boat badly wounded and write a lengthy screed in which he regurgitated the language and the rhetoric of jihadis all over the world. >> earlier today the suspect only managing head nods and a single word as the charges were read to him in his hospital room. >> dzokhar tsarnaev will be charged with 30 federal counts, including conspiring to use a weapon of mass destruction. 17 of the charges carry a possible death sentence. he will plead not guilty. up next, survivors finally come face-to-face with dzokhar tsarnaev.

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in the months after the bombing, still recovering from his wounds, dzhokar tsarnaev

remains defiant. in his jail cell before his arraignment, he taunts u.s. marshals. when his trial begins two years later, judy clark will lead the defense team. >> judy clark is a legend in american criminal defense. this is a woman who is famous for taking impossible cases and not getting acquittals, but getting life sentences as opposed to death sentences, which is not an easy thing. >> as she was led into court, he was glancing over his right shoulder and smiling and smirking at his relatives behind him. i found that absolutely galling and reprehensible. >> judy clark got up there in the opening statement of the trial and said, it was him. those were her words. "it was him." this was obviously very strategic on the part of the

defense. >> clark's strategy, don't fight the charges, fight the death penalty. >> the defense is trying to show mitigation. yes, he's guilty, but, consider the following about him. consider his alienation from american society. consider the malevolent influence of his older brother, which led him, inexorably to this crime. >> but the prosecution team isn't buying it. >> the prosecution said, they were equal partners. if you put bombs down on a street and shred the legs of innocent men, women, and children, and then go into a store a half hour later and buy a half gone of milk, can you really blame that on your

brother? >> there was just so much evidence, they actually showed the jury what these bombs potentially looked like. they brought pressure cookers into the courtroom. they let them actually handle these pressure cookers and see what was inside. >> inside, nails and bbs designed to inflict maximum carnage. the blast destroyed both of jessica kensky's legs. >> jess kensky rolled by in her wheelchair with her service dog, looking for some kind of betrayal of human emotion, some sort of reaction to what was taking place around him, and we never saw anything. >> dzhokar seems disengaged, disinterested, and unaffected, just as he was the day of the bombings. >> you see dzhokar go in front

of the restaurant and he stops very specifically in back of a bunch of kids, who are lined up against the barriers. i think the most effective things that the prosecution said during its case is that dzhokar was there for four minutes. so in those four minutes, he could survey everything that was around him, and he left the bomb there and walked away. >> it was really difficult to watch, for anyone who was in that courtroom. there were tears with the jury. there were tears with the survivors who were in there. and there were tears in the media section. because you see these people ringing cow bells, cheering on the marathon, standing just feet from the runners, just elation. and in a moment, you just see the bomb go off. >> the jury also sees the

bloody, bullet-riddled message from inside the boat. dzhokar writes, "i do not mourn, because tamerlan's soul is very much alive." >> it speaks to that death cult kind of ethos, where if i die or those closest to me die fighting for the cause, then they're considered martyrs and they go to heaven. >> after presenting only four witnesses, the defense rests. >> the prosecutor closed by saying, they thought they were soldiers, they thought they were going to bring the battle to boston. >> yes, they absolutely do. although, overwhelmingly, those of that faith would say what they're doing is aberrant. in their minds, in their hearts, they feel what they're doing is completely about their religion. >> after a month of emotional testimony from more than 90 witnesses, the jury takes just 11 1/2 hours to reach a verdict. >> it was so quiet in that courtroom, you could feel the tension, you could feel the

nerves. >> dzhokar tsarnaev, guilty on all 30 counts. >> it took 20 minutes to read the verdict. and i don't remember hearing any noise. i didn't hear any sniffles, i didn't hear any shouts, i heard nothing. >> now, defense attorney judy clark will try to convince a jury dzhokar tsarnaev's life is worth saving. >> it takes 12 votes for a death sentence. so all the defense has to do is persuade one juror a death sentence is not appropriate. >> there were jurors wrestling in their own head, whether they could do it. and not only whether they could do it, whether they could sentence someone to death, whether they actually thought that was the worse thing they could do to somebody. >> as the trial moves forward,

the stories of pain, loss, and resilience are not easily forgotte forgotten. >> bo richards' testimony just talking about his family and what a perfect day it was and how they went to get ice cream and what got me is when he said, i could tell you the flavors that they had. i remember everything. and you just think back to that day, as a parent, you think, those are the moments you remember, the little details. you can't ever get back that perfect moment when they were sitting there eating ice cream and all three of your children were alive and all three of your children had their legs. it was a tough moment.

the dzhokar tsarnaev trial resumes in just hours, and as the defense tries to convince a jury to spare the life of a terrorist in boston, the white house confirms the attack in texas this weekend was also terror. this is "cnn tonight." i'm don lemon. were the texas shooters under orders from isis? were their lone wolves? and how were more plotters are out there right now? you may be surprised. and also, state attorney's marilyn mosby working to build her case in tagainst six police officers. and this prom picture sparking outrage all across the country. i'll speak exclusively to the mother of one of the students, she is outraged too,a