Key Witnesses In The Dzhokhar Tsarnaev Trial

After hearing from 154 witnesses over the course of more than two months, the jury in the trial of convicted Boston Marathon bomber sentenced him to death.

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.