The U.S. Supreme Court will review a lower court's decision from last summer that vacated the six death sentences imposed on Boston Marathon bomber Dzhokhar Tsarnaev. Here, artist Jane Flavell Collins pulls down her courtroom sketches outside the Moakley U.S. Courthouse in Boston after Tsarnaev was sentenced. John Blanding/Boston Globe via Getty Images hide caption
Flowers are placed at the memorial to the victims of the 2013 Boston Marathon bombings on April 20. Maddie Meyer/Getty Images hide caption
Dzhokhar Tsarnaev was convicted and sentenced to death for carrying out the April 15, 2013, Boston Marathon bombing attack. FBI via AP hide caption
Adidas apologized for its "insensitive" choice of words in a marketing email to customers sent a day after the 121st Boston Marathon. Elise Amendola/AP hide caption
In this courtroom sketch, Dzhokhar Tsarnaev (center) is depicted between defense attorneys Miriam Conrad (left) and Judy Clarke during his federal death penalty trial on March 5. Jane Flavell Collins/AP hide caption
Azamat Tazhayakov, left, Dias Kadyrbayev, center, and Robel Phillipos, right, college friends of convicted Boston Marathon bomber Dzhokhar Tsarnaev, sit during a hearing in federal court in Boston in May 2014. Jane Flavell Collins/AP hide caption
Dias Kadyrbayev, a college friend of Boston Marathon bombing suspect Dzhokhar Tsarnaev, is depicted in a court room sketch. Jane Flavell Collins/AP hide caption
Judy Clarke and David Bruck, Dzhokhar Tsarnaev's defense attorneys, leave the Moakley federal courthouse on April 8 after their client was found guilty. John Blanding/The Boston Globe via Getty Images hide caption
Dzhokhar Tsarnaev Handout/Getty Images hide caption
Dzhokhar Tsarnaev. Handout/Getty Images hide caption
Dzhokhar Tsarnaev. Handout/Getty Images hide caption
Dzhokhar Tsarnaev. Handout/Getty Images hide caption