Judge Formally Imposes Death Sentence for Boston Marathon Bomber Tsarnaev

Speaking publicly for the first time since his arrest, Tsarnaev told the packed courtroom that he was sorry for his role in the attacks that killed three and injured nearly 300.

"Immediately after the bombing that I am guilty of, I learned of some of the victims, their names, their faces, their ages," he said.

"I ask Allah for mercy on me, my brother, and my family," Tsarnaev added, fighting tears as he spoke. "I pray to Allah to bestow his mercy on you," he addressed the crowd, much of which consisted of survivors of the attack. "I pray for your relief, for your healing, for your well-being, for your health."

"No one will remember that your teachers were fond of you," he said, or that he was "funny," or a "good athlete," referencing comments from people who knew Tsarnaev in school.

Speaking after the hearing, Henry Borgard, who had been walking past the Boston Marathon's finish line when the bomb went off, told reporters that he's forgiven Tsarnaev for what he did, and that he does not believe in the death penalty.

"It took me a very long time, but I did forgive him," 23-year-old Borgard said. "I definitely appreciated the fact that he acknowledged our suffering."

Tsarnaev becomes the 62nd inmate on Federal death row, according to the Death Penalty Information Center.  He will likely be taken to the United States Penitentiary in Terre Haute, Indiana, where he will stay during an automatic appeals process that could take years.