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 Biden commuted the sentences of 37 federal death row inmates, sparing them from execution, but excluded three men convicted of notorious mass killings: Robert Bowers, who killed 11 worshippers at Pittsburgh's Tree of Life Synagogue in 2018;