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.

The 37 federal death row inmates whose sentences have been commuted to life without parole include four men who committed their crimes in Missouri. Two of those men, Norris Holder and Billie Allen, were convicted of murdering a security guard in 1997 while robbing a bank in St.