And that wraps up our coverage of the Boston bombing sentencing.
You can follow further developmentshere
"I have many conflicted emotions today" one bombing victim says outside the courthouse, saying she will continue to receive notices about appeals in the case,
"That personally is something I was hoping to avoid... this seems like a burden that will drag on."
Massachusetts US Attorney Carmen Ortiz said the Tsarnaev trial "showed the world what a fair jury trial is like".
"Even the worst of the worst deserve a fair trial... he will pay with his life for his crimes."
She added Tsarnaev's crime was not religious and does not reflect Muslim beliefs, but rather an ideology of hate.
Among those who testified for Tsarnaev's life to be spared was death penalty opponent Sister Helen Prejean, who was made famous by the movie Dead Man Walking.
Another Boston resident, Mohamed Bensadoc, 20, says he thinks the sentence is "fair, I guess... because of the scale of what he did".
BBC News, Boston
is speaking to people in Boston about the sentence.
"I wasn't surprised, no," says Matt Strom, 41, adding that he doesn't have a problem with the death sentence. "He's a dirt bag. He's a horrible person to do that to a bunch of innocent people."
Was justice served? "There's no way to get back the lives that were ended, so having his ended is, I guess, part of it. But I feel like there should be more."
Like what? "I wish - it's bad but I don't know - I wish he could die as many times. Maybe before he dies, somebody should blow his legs off."
Tsarnaev stood with his lawyers when he heard his fate in court.
One of the victims mentioned in the trial was Massachusetts Institute of Technology (MIT) officer Sean Collier, who was shot and killed by the Tsarnaevs in the days after the bombing.
MIT Police Chief John DiFava said in astatement: "I hope that the conclusion of the trial and the subsequent verdict can offer some kind of closure, no matter how small."
An AP reporter was the first to tell Anzor Tsarnaev, his father who lives in the Dagestan region of Russia, about Friday's verdict in Massachusetts.
He moaned deeply on hearing the news and hung up, the AP reports.
A point of clarification - Massachusetts as a state ended the death penalty in 1984, but Tsarnaev was tried on federal charges, meaning he was eligible for execution as a sentence.
There are 61 inmates currently on death row in the federal prison system - not including Tsarnaev or military cases. The last federal execution was in 2003.
BBC North America Editor
The irony of sentencing Tsarnaev to death is that this is not the end of the legal road. He'll be able to appeal against the death penalty and that process could take years, whereas if he had been sentenced to life imprisonment that would have been that.
Outside court, people reacted to the news as the sentence was announced.
Defence lawyer Judy Clarke calls the death penalty "legalised homicide".
She has been successful in avoiding such a fate for many previous high-profile clients, including Ted Kaczynski (the Unabomber), Eric Rudolph, who bombed the 1996 Atlanta Olympics and Jared Lee Loughner, the Arizona gunman who killed six and injured US Representative Gabrielle Giffords.
A Vanity Fairprofile said that "with Clarke in [Tsarnaev's] corner, it is doubtful that Tsarnaev will ever be put to death for the crime, even if he gets it in his head that he wants to be".
Reporters in the courtroom said Clarke put her hand over her mouth when the foreman read the sentence.
A makeshift memorial after the bombing was featured in an exhibit at Boston Public Library.
Boston Mayor Marty Walsh: "I hope this verdict provides a small amount of closure... We will forever remember and honour those who lost their lives and were affected by those senseless acts of violence on our city."
Washington correspondent, BBC News
Everybody in this not-so-large city knows someone who ran the marathon or was affected that day.
Reporters in court said Tsarnaev showed no emotion but later sat with his head down. Some jurors wiped away tears.
Three people were killed that day and many more were injured.
Amnesty International says it "condemns the bombings" but said the death penalty was "not justice".
"It will only compound the violence, and it will not deter others from committing similar crimes in the future.
"It is outrageous that the federal government imposes this cruel and inhuman punishment, particularly when the people of Massachusetts have abolished it in their state."
BBC News, Boston
Opposite the court house, across the bay, at a touristy dock area, groups of pedestrians have gathered around reporters to hear the details. Many are asking: "What's going on?" and then stay when they hear the news. Helicopters buzz overhead.
A photo taken by a bystander showed the two Tsarnaev brothers in the crowd before the bombings.
"This is very unlikely to be the end of the legal process" BBC's Gary O'Donoghue says outside court, adding appeals for years are likely.
"We know all too well that no verdict can heal the souls of those who lost loved ones, nor the minds and bodies of those who suffered life-changing injuries from this cowardly attack," Attorney General Loretta Lynch says in a statement.
"But the ultimate penalty is a fitting punishment for this horrific crime and we hope that the completion of this prosecution will bring some measure of closure to the victims and their families."
All jurors found Tsarnaev had "no remorse" about the crime. But three believe his brother Tamerlan "planned, led and directed" the bombing.
Tsarnaev has been sentenced to death
A protester holds a Boston Marathon medal outside the courthouse as the jury announces its verdict
The jury foreman is currently reading their answers to a list of questions needed before the sentencing verdict. Tara McKelveywrote about what's on this peculiar 24-page form and what it means for the sentence.
Dzhokhar Tsarnaev has been sentenced for his role in the 2013 Boston Marathon bombing.