Twin bombings shattered the euphoria near the Boston Marathon’s finish line on April 15, 2013.
Dzhokhar and Tamerlan Tsarnaev, brothers of Central Asian origin, planted two pressure-cooker bombs along the route of the marathon, killing three people and wounding at least 260.
Tamerlan Tsarnaev, 26, died days later after a gunbattle with police. Dzhokhar, then 19, was shot, wounded and captured.
Dzhokhar Tsarnaev was convicted of 30 counts at his federal trial and could face the death penalty.