“On April 15, 2013, Dzhokhar and Tamerlan Tsarnaev planted and detonated two homemade pressure-cooker bombs near the finish line of the Boston Marathon. The blasts hurled nails and metal debris into the assembled crowd, killing three while maiming and wounding hundreds. Three days later, the brothers murdered a campus police officer, carjacked a graduate student, and fired on police who had located them in the stolen vehicle. Dzhokhar attempted to flee in the vehicle but inadvertently killed Tamerlan by running him over. Dzhokhar was soon arrested and indicted. A jury found Dzhokhar guilty of 30 federal crimes and recommended the death penalty for 6 of them. The District Court accordingly sentenced Dzhokhar to death. The Court of Appeals vacated the death sentence. We now reverse” writes Justice Clarence Thomas in the 6-3 majority opinion.