Boston Marathon Victims Testify in Dzhokhar Tsarnaev Trial

ABC News’ Tom Llamas reports the latest news surrounding the much-anticipated trial.
2:50 | 03/10/15

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Transcript for Boston Marathon Victims Testify in Dzhokhar Tsarnaev Trial
Now to the Boston marathon bombing trial. Terrifying new video was played in court on Monday as more victims delivered emotional testimony as we learn how little emotions dzhokhar tsarnaev displayed right after he launched the attack. ABC's Tom llamas is covering the trial for us in Boston. Good morning, Tom. Reporter: Robin, good morning to you. The defense is trying to paint dzhokhar tsarnaev as a misguided youth who was just following the footsteps of his older brother but prosecutors say the video you're about to see shows a cold-blooded killer, someone who had no regard for the innocent men, women, even children in his path of terror because he was stands right next to them. The video is chilling. Alleged Boston marathon bomber dzhokhar tsarnaev caught on tape launching his attack. Watch this newly released video played in court on Monday, tsarnaev in the white hat appears to pick a spot in the crowd, slips off his backpack, believed to be holding the pressure cooker bomb, lingers, uses his cell phone, then seconds later at 2:49 P.M., the first bomb goes off, the crowd suddenly looks left. He starts to walk away. Seconds after that, his bomb goes off. A fireball erupting into the camera. Prosecutors also playing this new video from a nearby whole foods showing the then 19-year-old casually strolling into the store less than 15 minutes after the bombings heading to the dairy section buying a half gallon of milk before walking out and driving away. This calm scene playing out while chaos was unfolding back at the marathon finish line. Jurors also seen these new images and hearing from witnesses like Jessica kenski testifying from her wheelchair Monday saying she was so in shock after the blast she was unaware of what was happening until someone screamed, ma'am, you're on fire. Jurors also hearing from one of the heros from that day, Matthew Patterson, a critical care paramedic who was off duty during the bombings but jumped into action saving the life of 6-year-old Jane Richard who lost a leg and her older brother, martin, in the attack. I testified because I believe that Jane, Jane's voice needs to be heard and the damage that was done to her physically, emotionally and for the rest of her life. Reporter: Tsarnaev in court for the testimonies slouching in his chair appearing uninterested. He's pleaded not guilty to 30 counts against him including murder and the use of a weapon of mass destruction. And though he used his personal Twitter account to quote rappers like jay Z and eminem, prosecute prosecutors reveal he had another Twitter account under an alias where he quoted Anwar Al awlaki, a radical Muslim cleric also a member of Al Qaeda. George. Thanks very much.

This transcript has been automatically generated and may not be 100% accurate.

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