The courtroom was stone-cold quiet as defendant Dzhokhar Tzarnaev, 21 years of age, entered.
The jury had reached a verdict on each of the 30 charges he faced for the April 15 bombing at the finish line of the 2013 Boston Marathon.
Tzarnaev was found guilty of all charges against him.
Seventeen of those charges carry the possibility of death penalty.
Tsarnaev showed little emotion. He fidgeted occasionally. Stared down at the defense table. At one point, however, the defendant wrapped his arms across his chest as if to hold himself. It was a gesture that courtroom observers had not seen before.
Three people died within minutes at the scene of the Boylston Street bombing: Martin Richard (aged 8, of Dorchester), Lu Lingzi (A BU student from China), Krystal Campbell (a local restaurant manager from Medford).
264 were taken to local hospitals, eight with wounds so severe that they required limbs to be amputated.
An MIT police officer, Sean Collier, was killed in a subsequent, related incident.
And Richard Donahue, an MBTA worker, was shot seriously – possibly by friendly fire that raged in the attempt to capture Dzhokhar and his late brother Tamerlan.
After the verdict was concluded, Denise Richard, the mother of 8-year-old Martin, wiped tears from her eyes.
Her husband, Bill, embraced one of the prosecutors after the jury left the courtroom.
Boston Mayor Marty Walsh said in a statement he was thankful this phase of the trial was over.
"The incidents of those days have forever left a mark on our city," Walsh said. "As we remember those who lost so much, we reflect on how tragedy revealed our deepest values, and the best of who we are as a community."
The same jury that convicted Tsarnaev on all counts, will now hear evidence on whether he should get the death penalty or spend the rest of his life in prison.
Former U.S. Attorney for the District of Massachusetts Donald Stern tells WGBH News that he expects Judge George O'Toole to give a lot of latitude in the second phase of the trial.
"The rules of evidence strictly apply in the penalty phase. And you don't want to be the judge that excludes evidence that might be even marginally relevant to allow the jury to make this quite difficult and heart-wrenching-- literally life and death decision.
And secondly, you don't want to set up a situation where the defendant can argue on an appeal that this is critical evidence which the jury should have heard and if they had heard, it might have come out differently."
Today's verdict came after a day and a-half of deliberations.
Tsarnaev's lawyers admitted he participated in the bombings, but said his older brother -- who was later killed -- had been the driving force behind the deadly attack.
The Charges Against Dzhokhar Tsarnaev:
Count 1: Death penalty count. Conspiracy to use a weapon of mass destruction, resulting in death. Guilty.
Count 2: Death penalty count. Use of a weapon of mass destruction, Pressure Cooker Bomb #1, resulting in death; and aiding and abetting. Guilty.
Count 3: Death penalty count. Possession and use of a firearm, Pressure Cooker Bomb #1 during and in relation to a crime of violence, resulting in death; and aiding and abetting. Guilty.
Count 4: Death penalty count. Use of a weapon of mass destruction, Pressure Cooker Bomb #2, resulting in death; and aiding and abetting. Guilty.
Count 5: Death penalty count. Possession and use of a firearm --Pressure Cooker Bomb #2 during and in relation to a crime of violence, resulting in death; and aiding and abetting. Guilty.
Count 6: Death penalty count. Conspiracy to bomb a place of public use, resulting in death. Guilty.
Count 7: Death penalty count. Bombing of a place of public use, Pressure Cooker Bomb #1, resulting in death; aiding and abetting. Guilty.
Count 8: Death penalty count. Possession and use of a firearm, Pressure Cooker Bomb #1, during and in relation to a crime of violence, resulting in death; aiding and abetting. Guilty.
Count 9: Death penalty count. Bombing of a place of public use, Pressure Cooker Bomb #2, resulting in death; aiding and abetting. Guilty.
Count 10: Death penalty count. Possession and use of a firearm, Pressure Cooker Bomb #2 during and in relation to a crime of violence, resulting in death; aiding and abetting. Guilty.
Count 11: Conspiracy to maliciously destroy property, resulting in death. Guilty.
Count 12: Death penalty count. Malicious destruction of property by means of an explosive, Pressure Cooker Bomb #1, resulting in death; aiding and abetting. Guilty.
Count 13: Death penalty count. Possession and use of a firearm, Pressure Cooker Bomb #1, during and in relation to a crime of violence, resulting in death; aiding and abetting. Guilty.
Count 14: Death penalty count. Malicious destruction of property by means of an explosive, Pressure Cooker Bomb #2, resulting in death; aiding and abetting. Guilty.
Count 15: Death penalty count. Possession and use of a firearm, Pressure Cooker Bomb #2, during and in relation to a crime of violence, resulting in death; aiding and abetting. Guilty.
Count 16: Death penalty count. Possession and use of a firearm, Ruger P95 9mm semiautomatic handgun during and in relation to a crime of violence, resulting in death; aiding and abetting. Guilty.
Count 17: Death penalty count. Possession and use of a firearm, Ruger P95 9mm semiautomatic handgun during and in relation to a crime of violence, resulting in death; aiding and abetting. Guilty.
Count 18: Death penalty count. Possession and use of a firearm, Ruger P95 9mm semiautomatic handgun during and in relation to a crime of violence, resulting in death; aiding and abetting. Guilty.
Count 19: Carjacking, resulting in serious bodily injury; aiding and abetting. Guilty.
Count 20: Possession and use of a firearm, Ruger P95 9mm semiautomatic handgun) during and in relation to a crime of violence; aiding and abetting. Guilty.
Count 21: Interference with commerce by threats and violence; aiding and abetting. Guilty.
Count 22: Possession and use of a firearm Ruger P95 9mm semiautomatic handgun during and in relation to a crime of violence; aiding and abetting. Guilty.
Count 23: Use of a weapon of mass destruction, Pressure Cooker Bomb #3, on or about April 19, 2013, in the vicinity of Laurel Street and Dexter Avenue in Watertown; aiding and abetting. Guilty.
Count 24: Possession and use of a firearm, a Ruger P95 9mm semiautomatic handgun and Pressure Cooker Bomb #3, during and in relation to a crime of violence; aiding and abetting. Guilty.
Count 25: Use of a weapon of mass destruction, Pipe Bomb #1, on or about April 19, 2013, in the vicinity of Laurel Street and Dexter Avenue in Watertown; aiding and abetting. Guilty.
Count 26: Possession and use of a firearm, a Ruger P95 9mm semiautomatic handgun and Pipe Bomb #1, during and in relation to a crime of violence; aiding and abetting. Guilty.
Count 27: Use of a weapon of mass destruction, Pipe Bomb #2 on or about April 19, 2013, in the vicinity of Laurel Street and Dexter Avenue in Watertown; aiding and abetting. Guilty.
Count 28: Possession and use of a firearm, a Ruger P95 9mm semiautomatic handgun and Pipe Bomb #2, during and in relation to a crime of violence; aiding and abetting. Guilty.
Count 29: Use of a weapon of mass destruction, Pipe Bomb #3 on or about April 19, 2013, in the vicinity of Laurel Street and Dexter Avenue in Watertown; aiding and abetting. Guilty.
Count 30: Possession and use of a firearm, a Ruger P95 9mm semiautomatic handgun and Pipe Bomb #3, during and in relation to a crime of violence; aiding and abetting. Guilty.