Tsarnaev was convicted of all 30 charges against him, including conspiracy and use of a weapon of mass destruction and the killing of Massachusetts Institute of Technology Police Officer Sean Collier during the getaway attempt. Prosecutors said the brothers carried out the attack to punish the U.S. for wars in Muslim countries.

President Joe Biden has opted not to commute the death sentence for Dylann Roof, who murdered nine members of a historically black church during a Bible study, and two others.

Roof was convicted on 33 federal charges after nine people were killed and another was injured in a shooting at a Charleston church.