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Painful, the medical examiner testified. he didn't die immediately, but it was quick. blast injuries to her lower legs a piece of jagged metal buried in one leg. near the finish line crystal campbell lost too much blood, it happened too fast. the governments rests their case with graphic details of the final aching moments. prosecutors highlight images of dzokhar, standing with his backpack bomb next to the richard family. walking away with just a backwards glance before the deadly blasts accused of 30 federal charges, defense attorneys conceded in opening statements he did it but they're call...

>> the prosecution showed jurors surveillance video, not seen by the public before shows tsarnaev dropping his backpack bomb, then fleeing. seconds later, the bomb goes off. what's the strategy showing this horrific video? >> first of all, the testimony so far has been very graphic. the strategy now has moved from the why or if he did it to why he did it so the defense team strategy here since during opening statement there was admission that the defendant did, in fact do it so it appears the defense is trying to save his life at this point, so the prosecutors, 30 of the counts jose 17 of them...

Tears yesterday when will richard talk and the loss of his 8-year-old son martin. youngest of the three victims killed in the terror attack. more now from nbc's peter alexander. >> reporter: amid the carnage after the second bomb exploded that day bill richard faced and agonizing decision. leave his dying son to save his injured daughter. he described his last moments with 8-year-old martin. i knew from what i saw there was no chance. i knew in my head i needed to act quickly we would not only lose martin but jane too. jeff bowman recalled making eye contact with dzhokhar tsarnaev older brothe...

Movie. one man saying the smoky air smelled like the fourth of july. the chaos and the carnage in the aftermath here caught on tape by a wounded spectator. frantic emergency workers try to treat the most seriously injured first. the jury also heard from this boston police officer rescued a 3-year-old boy, from a man who lost both legs carried off by stranger in a cowboy hat. and from bill richard, whose family watched the marathon steps away from tsarnaev and the backpack bomb. his 8-year-old son, martin, was killed, his 7-year-old daughter lost her leg. a somber parade of victims in court, te...

>> to former fbi investigator william daly who is more concerned with how the kid got on the plane than how he survived. very important question. there's security video. no one watches that stuff? >> amazing. for those who travel, it is really sobering, to think that this kid, without any special apparatus or equipment, trying to do a mission impossible around the alarm system, is able to get through airport security, get on the wheel well, which is that pilot does a walk-around check so this kid had a window of time to get on to the plane around people who were loading luggage, thing fuel, an...