i'm paula newton. this is "cnn newsroom." it has been just over two years since the pair of bombs exploded at the boston marathon. 21-year-old dzhokhar tsaranev admitted he was responsible and now he has been sentenced to death by lethal injection. sar sta tsaranev the first terrorist sentenced since 9/11. he and his brother set off two bombs 12 second apart near the finish line of the boston marathon. you might remember this horrific scene. the home made pressure cooker bombs were filled with nails and bbs and loaded into backpacks. they caused horrific injuries. at least 17 people lost limbs and they killed three people from left to right, 8-year-old martin richard, 29-year-old krystle campbell, and 23-year-old lindsay lu. three days later the brothers shot and killed police officer, sean collier. dzhokhar tsaranev was not sentenced to death for that shooting. fire fighter michael ward a first responder at the bombing said eit was the right decision to sentence tsaranev to death >> he wanted to go to

i'm paula newton. this is "cnn newsroom." it has been just over two years since the pair of