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

itoggle caption Jane Flavell Collins/AP

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

itoggle caption Jane Flavell Collins/AP

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

itoggle caption Jane Flavell Collins/AP

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

itoggle caption Michael Dwyer/AP

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

itoggle caption Andrew Burton /Getty Images

Boston bombings suspect Dzhokhar Tsarnaev on April 19, 2013, as he emerged from a boat stored in a Watertown, Mass., backyard. The red dot of a police sharpshooter's laser sight can be seen on his forehead. Mass. State Police Sgt. Sean Murphy/Boston Magazine hide caption

itoggle caption Mass. State Police Sgt. Sean Murphy/Boston Magazine

Blue and yellow are the colors for tributes to victims of the Boston Marathon. Street lights on the route of this year's race are among the places they're showing up. Andrew Burton/Getty Images hide caption

itoggle caption Andrew Burton/Getty Images

Tamerlan Tsarnaev, as seen in a video taken on April 15 near the finish line of the Boston Marathon. FBI.gov hide caption

itoggle caption FBI.gov

Boston bombings suspect Dzhokhar Tsarnaev on April 19 as he emerged from a boat stored in a Watertown, Mass., backyard. The red dot of a police sharpshooter's laser sight can be seen on his forehead. Mass. State Police Sgt. Sean Murphy/Boston Magazine hide caption

itoggle caption Mass. State Police Sgt. Sean Murphy/Boston Magazine

Boston bombings suspect Dzhokhar Tsarnaev on April 19 as he emerged from a boat stored in a Watertown, Mass., backyard. The red dot of a police sharpshooter's laser sight can be seen on his forehead. Mass. State Police Sgt. Sean Murphy/Boston Magazine hide caption

itoggle caption Mass. State Police Sgt. Sean Murphy/Boston Magazine