Calling Dzhokhar Tsarnaev an "unrepentant killer," federal prosecutors are urging the jury to impose a sentence of death on the convicted Boston Marathon bomber.
The second phase of the trial began Tuesday.
WBUR's David Boeri joins Morning Edition to report on the emotional beginning to the second sentencing phase of the trial.
To hear the full report, click on the audio player above.
This segment aired on April 22, 2015.