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 announced Monday that he had commuted the sentences of 37 of the 40 current federal death row inmates to life in prison without the possibility of parole.

Biden's move to commute death row sentences was welcomed by Martin Luther King III, calling it a "meaningful and lasting action."