US judge formally sentenced convicted Boston bomber Dzhokhar Tsarnaev to death on Wednesday.
Tsarnaev, who alongside his brother Tarmalin committed the gruesome act went both went on the run and killed a police officer, before Tamerlan was shot dead and Tsarnaev arrested, four days later.
He was found, injured, in a grounded boat on which he had scrawled a bloody message defending the attacks as a means to avenge US wars in Iraq and Afghanistan.
Judge George O’Toole officially imposed the death sentence, which had been reached unanimously by the 12-person jury on May 15.
“I sentence you to the penalty of death by execution,” O’Toole told Tsarnaev, before he was led away by US Marshals.
Moments before he was sentenced, Tsarnaev apologized for the first time to his victims for the suffering he caused.
“I would like to now apologize to the victims and to the survivors,” said the 21-year-old former university student in his first public remarks since the April 15, 2013 bombings that killed three people.
“I am guilty,” he said, standing pale and thin in a dark blazer. “Let there be no doubt about that.”
The former pot-smoker said he listened throughout the 12-week trial as he learnt about the victims from often harrowing testimony.
“I am sorry for the lives I have taken, for the suffering, the damage that I have done,” he said, beginning his remarks in the name of Allah and asking for God’s forgiveness.
“I pray to Allah to bestow his mercy upon the deceased,” he said. “I ask Allah to have mercy upon me, upon my brother, upon my family.”