The same jury had previously found Dzhokar Tsarnaev guilty on all 30 charges against him, 17 of which were capital counts. Of those 17 counts, the jury returned the death sentence on six.
Below are profiles of key witnesses. What makes them key witnesses? Some provided details that had not been heard before, while others recounted their encounters with the Tsarnaev brothers.
Clarification: One of the defense's four called witnesses had earlier been called by the prosecution.
This article was originally published on April 02, 2015.