A jury of seven women and five men Friday sentenced 21-year-old Boston Marathon bomber Dzhokhar Tsarnaev to death, which in federal cases is by lethal injection.

After hearing more than 40 witnesses in what is known as the penalty phase of the trial, the jurors deliberated for 14 hours before meting out punishment.

Tsarnaev, who has remained impassive or stoic (depending on your point of view) throughout the trial was true to form and displayed no discernable emotion.

Several jurors were seen crying after the verdict was delivered.

While at the time of this writing jurors have yet to be interviewed, journalists who sat through the trial said that it was an intellectually challenging and emotionally draining experience.

Massachusetts has no state death penalty. But the federal government does, and then Attorney General Eric Holder pushed for its application, a decision endorsed by current AG Loretta Lynch.

In the weeks preceding the final decision in the Marathon bombing case, there was much speculation that the Tsarnaev jury would reflect popular opinion — as registered by several recent polls — and vote for life imprisonment. That speculation, however, lost site of the fact that in the painstaking jury selection process, potential jurors had to be open to the idea of applying the death penalty in order to be impaneled.

Six weeks ago, the jury unanimously convicted Tsarnaev on all 17 capital charges stemming from his role — along with his deceased older brother Tamerlan — in the April 2013 Back Bay bombing.

Blasts from two homemade bombs — fashioned from pressure cookers and assembled in the Tsarnaev family’s cramped Cambridge apartment — killed three and maimed or wounded 260 others near the finish line on Boylston Street.

Tamerlan subsequently killed Massachusetts Institute of Technology campus police officer Sean Collier in a shootout. MBTA police officer Richard Donohue nearly lost his life as well, and — in a freak bit of timing — returned to work the day the Tsarnaev verdict was reached.

Tsarnaev’s lawyers stunned the courtroom inside the John Joseph Moakley United States Courthouse on Boston’s waterfront when they opened their defense by immediately admitting their client’s guilt.

The defense then went on to argue that Dzhokhar – 19 years old at the time of his homicidal terror spree – was under the sway of his older, criminally-inclined, and jihad-obsessed brother Tamerlan, who for reasons rooted in their native culture of Chechnya exercised commanding sway over his sibling.

The strategy obviously failed.

Mitigating circumstances were no match for a cold-blooded act of terror that claimed the life not only of an 8-year-old, but two others and for some time ripped the heart out of a proud but wounded city.

The defense team left the courthouse without answering questions from the press.

An appeal is expected.

While the jury rendered a death verdict, presiding U.S. Judge George O’Toole has not yet passed an official sentence. Scheduling for that will be forthcoming.

If Justice Department practice holds true, Tsarnaev will ultimately be transferred to the United States Penitentiary, Terre Haute, Indiana, which houses the federal death row for men and the federal execution chamber.

This is where in July of 2001 Timothy McVeigh was killed by lethal injection for his role in the Oklahoma City Bombing.