The 21-year-old will be sentenced by Judge George O'Toole on June 24.
The jury deliberated for almost 15 hours; defense lawyers were expected to quickly appeal the death sentence.
Assistant U.S. Attorney said the ethnic Chechen had turned against his adopted country.
Here's what we know about the Boston Marathon bomber from the two phases of his trial.
Boston Marathon bomber Dzhokhar Tsarnaev told a Roman Catholic nun and prominent death-penalty opponent that "no one deserves to suffer" as the victims of the deadly 2013 attacks had.
The defense narrative goes like this: Dzhokhar wanted to live; Tamerlan, was determined to become a martyr.
Katherine's mother, Judith Russell, testified that she didn't want her daughter to be with Tamerlan Tsarnaev.
Once a heavy drinker, a Boston Bomber transformed into someone obsessed with Islam.
"The image is extremely powerful, and the jury won't be able to put it aside."
The debate over the death penalty has become even more contentious as of late.
A new book examines what shaped the men who launched the Boston Marathon attack.
"I went to check on the boat and basically see why the strap was loose and I noticed a lot of blood."
Watertown Police patrolman John Reynolds recalled chasing the brothers in two cars.
Tsarnaev, 21, is charged with killing three people and injuring 264 with a pair of homemade bombs.
Dzhokhar Tsarnaev is accused of carrying out the April 2013 bombing at the Boston Marathon with his brother.
The accused, Dzhokhar Tsarnaev, could face the death penalty if found guilty of the April 2013 Boston attack
Robel Phillipos and two friends removed a backpack containing empty fireworks shells from the suspected bomber's room.
Tazhayakov's case has brought to light some new details about Tsarnaev himself, who will begin trial for 30 charges in November.
No American athlete has stood atop the podium on Boston's Boylston Street, not far from the site of last year's bombing, since 1985
Speakers recalled how people on the scene reacted immediately to help the wounded amid a chaotic scene