Tsarnaev, 21, standing at the defense table and speaking in a low voice, said he was sorry without ever turning to face his victims.
"I would like to now apologize to the victims and the survivors," he said. "I am sorry for the lives that I have taken."
Judge George O'Toole formally sentenced Tsarnaev to death, a decision already made by a federal jury.
"Whenever your name is mentioned, what will be remembered is the evil you did," the judge told him. "What will be remembered is you murdered and maimed innocent people."
source: http://www.cnn.com/2015/06/24/us/tsarnaev-boston-marathon-bombing-death-sentencing/