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
Dzhokhar Tsarnaev. Handout/Getty Images hide caption
Dzhokhar Tsarnaev. Handout/Getty Images hide caption
In this courtroom sketch, defense attorney Judy Clarke is depicted addressing the jury as defendant Dzhokhar Tsarnaev sits during closing arguments in his federal death penalty trial on Monday. Jane Flavell Collins/AP hide caption
Dzhokhar Tsarnaev (center) is depicted in this courtroom sketch between defense attorneys Miriam Conrad (left) and Judy Clarke during his federal death penalty trial in Boston. Jane Flavell Collins/AP hide caption
Boston Marathon bombing survivor Karen Brassard (left) and bombing witness Carlos Arredondo (right) leave a federal courthouse last week during the trial of accused bomber Dzhokhar Tsarnaev in Boston. Brian Snyder/Reuters/Landov hide caption
In this courtroom sketch, Boston Marathon bombing suspect Dzhokhar Tsarnaev is depicted sitting in federal court for a pretrial hearing in Boston on Dec. 18. Tsarnaev is charged with the April 2013 bombing that killed three people and injured more than 260. He could face the death penalty if convicted. Jane Flavell Collins/AP hide caption
In this courtroom sketch, Boston Marathon bombing suspect Dzhokhar Tsarnaev (third from right) is depicted with his lawyers and U.S. District Judge George O'Toole Jr., as O'Toole addresses a pool of potential jurors. The trial begins Wednesday. Michael Dwyer/AP hide caption
A memorial at the site of the first explosion in the Boston Marathon bombing. Defense attorneys say too many people in the potential jury pool have some kind of personal connection to the case. Andrew Burton/Getty Images hide caption