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In this Friday, April 19, 2013 Massachusetts State Police photo, 19-year-old Boston Marathon bombing suspect Dzhokhar Tsarnaev, bloody and disheveled with the red dot of a sniper's rifle laser sight on his forehead, raises his hand from inside a boat at the time of his capture by law enforcement authorities in Watertown, Mass. (AP Photo/Massachusetts State Police, Sean Murphy) ( APTOPIX Boston Marathon Bombing )

In this Friday, April 19, 2013 Massachusetts State Police photo, 19-year-old Boston Marathon bombing suspect Dzhokhar Tsarnaev, with the red dot of a sniper's rifle laser sight on the top of his head, leans over a part of a boat where he had been hiding moments before his capture by law enforcement authorities in Watertown, Mass. (AP Photo/Massachusetts State Police, Sean Murphy) ( Boston Marathon Bombing )

Boston Marathon bombing suspect Dzhokhar Tsarnaev leans over in a boat at the time of his capture by law enforcement authorities in Watertown, Mass. Photos of the Boston Marathon bombing suspect's surrender have been posted on the Boston Magazine website. The additional images, made public Tuesday, Aug. 27, 2013, were among those released to the magazine last month by a state police photographer. (AP Photo/Massachusetts State Police, Sean Murphy) ( Boston Marathon Photos )

In this Friday, April 19, 2013 Massachusetts State Police photo, 19-year-old Boston Marathon bombing suspect Dzhokhar Tsarnaev, bloody and disheveled with the red dot of a sniper's rifle laser sight on his head, emerges from a boat at the time of his capture by law enforcement authorities in Watertown, Mass. (AP Photo/Massachusetts State Police, Sean Murphy) ( APTOPIX Boston Marathon Bombing )

Boston Marathon bombing suspect Dzhokhar Tsarnaev lifts his shirt while standing in a boat at the time of his capture by law enforcement authorities in Watertown, Mass. Photos of the Boston Marathon bombing suspect's surrender have been posted on the Boston Magazine website. The additional images, made public Tuesday, August 27, 2013, were among those released to the magazine last month by a state police photographer. (AP Photo/Massachusetts State Police, Sean Murphy) ( Boston Marathon Photos )

In this Friday, April 19, 2013 Massachusetts State Police photo, tactical emergency medical technicians tend to 19-year-old Boston Marathon bombing suspect Dzhokhar Tsarnaev at the time of his capture by law enforcement authorities in Watertown, Mass. (AP Photo/Massachusetts State Police, Sean Murphy) ( Boston Marathon Bombing )

Tactical emergency medical technicians tend to Boston Marathon bombing suspect Dzhokhar Tsarnaev at the time of his capture by law enforcement authorities in Watertown, Mass on April 19, 2013. Photos of the Boston Marathon bombing suspect's surrender have been posted on the Boston Magazine website. The additional images, made public Tuesday, Aug. 27, 2013 were among those released to the magazine last month by a state police photographer. (AP Photo/Massachusetts State Police, Sean Murphy) ( Boston Marathon Photos )

In this Friday, April 19, 2013 Massachusetts State Police photo, 19-year-old Boston Marathon bombing suspect Dzhokhar Tsarnaev is placed into an ambulance by medical personnel following his capture by law enforcement authorities in Watertown, Mass. (AP Photo/Massachusetts State Police, Sean Murphy) ( Boston Marathon Bombing )

In this Friday, April 19, 2013 Massachusetts State Police photo Boston Marathon bombing suspect Dzhokhar Tsarnaev leans over in a boat as law enforcement officials point rifles at him at the time of his capture in Watertown, Mass. Photos of the Boston Marathon bombing suspect's surrender have been posted on the Boston Magazine website. The additional images, made public Tuesday, Aug. 27, 2013 were among those released to the magazine last month by a state police photographer. (AP Photo/Massachusetts State Police, Sean Murphy) ( Boston Marathon Photos )

Tactical emergency medical technicians tend to Marathon bombing suspect Dzhokhar Tsarnaev, partially obscured center, at the time of his capture by law enforcement authorities in Watertown, Mass. Photos of the Boston Marathon bombing suspect's surrender have been posted on the Boston Magazine website. The additional images, made public Tuesday, Aug. 27, 2013 were among those released to the magazine last month by a state police photographer. (AP Photo/Massachusetts State Police, Sean Murphy) ( Boston Marathon Photos )

Tactical emergency medical technicians tend to Boston Marathon bombing suspect Dzhokhar Tsarnaev, partially obscured center, at the time of his capture by law enforcement authorities in Watertown, Mass. Photos of the Boston Marathon bombing suspect's surrender have been posted on the Boston Magazine website. The additional images, made public Tuesday, Aug. 27, 2013 were among those released to the magazine last month by a state police photographer. (AP Photo/Massachusetts State Police, Sean Murphy) ( Boston Marathon Photos )

Massachusetts State Police, law enforcement officials apprehend Boston Marathon bombing suspect Dzhokhar Tsarnaev at the time of his capture in Watertown, Mass. Photos of the Boston Marathon bombing suspect's surrender have been posted on the Boston Magazine website. The additional images, made public Tuesday, Aug. 27, 2013 were among those released to the magazine last month by a state police photographer. (AP Photo/Massachusetts State Police, Sean Murphy) ( Boston Marathon Photos )

In this Friday, April 19, 2013 Massachusetts State Police photo, law enforcement officials converge on a covered boat where 19-year-old Boston Marathon bombing suspect Dzhokhar Tsarnaev is hiding moments before his capture in Watertown, Mass. (AP Photo/Massachusetts State Police, Sean Murphy) ( Boston Marathon Bombing )

In this Friday, April 19, 2013 Massachusetts State Police photo, state troopers dressed in protective gear hold weapons as they stand near a home, in Watertown, Mass. Later that night, 19-year-old Boston Marathon bombing suspect Dzhokhar Tsarnaev was captured. (AP Photo/Massachusetts State Police, Sean Murphy) ( Boston Marathon Bombing )

In this April 19, 2013, photo, law enforcement vehicles drive to the scene near where Boston Marathon bombing suspect Dzhokhar Tsarnaev was thought to be hiding in Watertown, Mass. Tsarnaev was captured later that night, bleeding and hiding in a boat in a nearby backyard. (AP Photo/Massachusetts State Police, Sean Murphy) ( Boston Marathon Photos )

In this image from video provided by WBZ TV, a bomb explodes near the finish line of the Boston Marathon in Boston on Monday, April 15, 2013. (AP Photo/WBZTV) ( Boston Marathon Explosions Photo Package )

People react to an explosion at the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. (AP Photo/The Daily Free Press, Kenshin Okubo) ( APTOPIX Boston Marathon Explosions )

A Boston Marathon competitor and Boston police run from the area of an explosion near the finish line in Boston, Monday, April 15, 2013. (AP Photo/MetroWest Daily News, Ken McGagh) ( Boston Marathon-Explosions )

Medical responders run an injured man past the finish line the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. (AP Photo/Charles Krupa) ( APTOPIX Boston Marathon Explosion )

In this photo provided by The Daily Free Press and Kenshin Okubo, people react to an explosion at the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. (AP Photo/The Daily Free Press, Kenshin Okubo) ( Boston Marathon Explosions )

Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013. (AP Photo/Charles Krupa) ( APTOPIX Boston Marathon Explosions )

In this photo provided by The Daily Free Press and Kenshin Okubo, people assist an injured after an explosion at the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. (AP Photo/The Daily Free Press, Kenshin Okubo) ( Boston Marathon Explosions )

In this Monday, April 15, 2013 photo, Boston Firefighter James Plourde carries an injured girl away from the scene after a bombing near the finish line of the Boston Marathon in Boston. The FBI's investigation into the bombings at the Boston Marathon was in full swing Tuesday, with authorities serving a warrant on a suburban Boston home and appealing for any private video, audio and still images of the blasts that killed at least three and wounded more than 170. (AP Photo/MetroWest Daily News, Ken McGagh) ( Boston Marathon Explosions )

This photo provided by the Federal Bureau of Investigation shows Boston Marathon bombing suspect Dzhokhar Tsarnaev. A federal grand jury in Boston returned a 30-count indictment against Tsarnaev on Thursday, June 27, 2013, on charges including using a weapon of mass destruction and bombing a place of public use, resulting in death. (AP Photo/Federal Bureau of Investigation, File) ( Boston Marathion Bombings )

An unidentified Boston Marathon runner leaves the course crying near Copley Square following an explosion in Boston Monday, April 15, 2013. (AP Photo/Winslow Townson) ( Boston Marathon-Explosions )

BOSTON, MA - APRIL 22: Kevin Brown, who made some of the memorial wooden crosees for the victims, observes a moment of silence at a makeshift memorial near the finish line of the Boston Marathon bomings on one week anniversary of the bombings on April 22, 2013 in Medford, Massachusetts. A manhunt ended for Dzhokhar A. Tsarnaev, 19, a suspect in the Boston Marathon bombing after he was apprehended on a boat parked on a residential property in Watertown, Massachusetts. His brother Tamerlan Tsarnaev, 26, the other suspect, was shot and killed after a car chase and shootout with police. The bombing, on April 15 at the finish line of the marathon, killed three people and wounded at least 170. (Photo by Kevork Djansezian/Getty Images) ( 167209746 )

A person writes on a poster at a makeshift memorial in Copley Square on Boylston Street in Boston, Wednesday, April 24, 2013. Traffic was allowed to flow all the way down Boylston Street on Wednesday morning for the first time since two explosions on April 15.(AP Photo/Michael Dwyer) ( Boston Marathon Finish Line )

This combination of undated file photos shows, from left, Krystle Campbell, 29, Lu Lingzi, a Boston University graduate student from China, and Martin Richard, 8, all who were killed in the bombings near the finish line of the Boston Marathon on April 15, 2013, in Boston. Prosecutors rested their case Monday, March 30, 2015, against Boston Marathon bomber Dzhokhar Tsarnaev, after jurors in his federal death penalty trial saw gruesome autopsy photos and heard a medical examiner describe the devastating injuries suffered by the three people who died in the 2013 terror attack. (AP Photo/File) ( Boston Marathon Bombing )

In this courtroom sketch, Assistant U.S. Attorney Aloke Chakravarty is depicted pointing to defendant Dzhokhar Tsarnaev, right, during closing arguments in Tsarnaev's federal death penalty trial Monday, April 6, 2015, in Boston. Tsarnaev is charged with conspiring with his brother to place two bombs near the Boston Marathon finish line in April 2013, killing three and injuring 260 people. (AP Photo/Jane Flavell Collins) ( Boston Marathon Bombing )

Boston Police commissioner William Evans addresses the media after the verdict in the penalty phase of the trial of Boston Marathon bomber Dzhokhar Tsarnaev, Friday, May 15, 2015. Evans said that Tsarnaev's actions of planting a bomb behind the Martin family on the afternoon of the race were diabolical. The federal jury ruled that the 21-year-old Tsarnaev should be sentenced to death by lethal injection for his role in the deadly 2013 attack. (AP Photo/Charles Krupa) ( Boston Marathon Bombing )

Karen Snyder, right, and Kathryn Vanwie react to the announcement of the death penalty verdict for Dzhokhar Tsarnaev outside the John Joseph Moakley United States Courthouse Friday, May 15, 2015, in Boston. Tsarnaev was charged with conspiring with his brother to place two bombs near the Boston Marathon finish line that killed three and injured 260 spectators in April 2013. Both women felt the verdict was fair. (AP Photo/Stephan Savoia) ( Boston Marathon Bombing )

In this Friday, April 19, 2013 file photo, a woman carries a girl from a home as a SWAT team searching for a suspect in the Boston Marathon bombings enters the building in Watertown, Mass. (AP Photo/Charles Krupa) ( Boston Marathon Bombing Photo Gallery )

In this Friday, April 19, 2013 file photo, police officers guard the entrance to Franklin Street where there is an active crime scene search for the suspect in the Boston Marathon bombings in Watertown, Mass. (AP Photo/Matt Rourke) ( Boston Marathon Bombing Photo Gallery )

This undated file photo released by the Middlesex District Attorney's Office shows Massachusetts Institute of Technology Police Officer Sean Collier, of Somerville, Mass. Collier was shot to death Thursday, April 18, 2013 on the school's campus in Cambridge, Mass. as Boston Marathon bombers Tamerlan and Dzhokhar Tsarnaev were fleeing several days after the Boston Marathon explosions. On Friday, May 15, 2015, Dzhokhar Tsarnaev was sentenced to death by lethal injection for the terror attack. (AP Photo/Middlesex District Attorney's Office, File) ( Boston Marathon Bombing Photo Gallery )

U.S. Attorney Carmen Ortiz for Massachusetts speaks to the media outside the John Joseph Moakley United States Courthouse May 15, 2014 in Boston, Massachusetts. Ortiz announced the death penalty sentence for the convicted Boston Marathon bomber, Dzhokhar Tsarnaev. (Photo by Darren McCollester/Getty Images) ( 473510260 )

In this courtroom sketch, Boston Marathon bomber Dzhokhar Tsarnaev stands as a death by lethal injection sentence is read at the Moakley Federal court house in the penalty phase of his trial in Boston, Friday, May 15, 2015. The federal jury ruled that the 21-year-old Tsarnaev should be sentenced to death for his role in the deadly 2013 attack. (Jane Flavell Collins via AP) ( Boston Marathon Bombing )

In this Wednesday, July 3, 2013 file photo, Mery Daniel, a Boston Marathon bombing survivor, takes a break during a prosthetic leg exercise session with her physical therapist, Jessica Guilbert, at Spaulding Rehabilitation Hospital in Boston. Daniel, a 31-year-old medical school graduate, lost most of her left leg in the blast that killed three people and injured more than 260 others. (AP Photo/Charles Krupa) ( Boston Marathon Bombing Photo Gallery )

In this Thursday, May 9, 2013 file photo, Marc Fucarile, center, holds hands with his mother, Maureen Fucarile, left, and his fiancee Jennifer Regan, right, in his room at Massachusetts General Hospital in Boston. Fucarile was only feet away from one of the bomb blasts Monday, April 15 near the finish line of the Boston Marathon that resulted in the loss of one leg, severe damage to the other, as well as burns, and a piece of shrapnel lodged in his heart. (AP Photo/Steven Senne) ( Boston Marathon Bombing Photo Gallery )