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

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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

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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

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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

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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

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