Darren McCollester/Getty Images
Investigators work around the boat where Dzhokhar A. Tsarnaev was found hiding after a massive manhunt, in the backyard of a Franklin Street home in Watertown, Mass., April 20, 2013.
Thermal images taken on April 19, 2013 show Tsarnaev in the boat. His brother Tamerlan Tsarnaev, 26, the other suspect in the April 15 bombings of the Boston Marathon, was shot and killed after a car chase and shootout with police. The bombings killed three people and wounded at least 170.
Massachusetts State Police
Thermal images taken on April 19, 2013 show Dzhokhar A. Tsarnaev hiding in a boat after a massive manhunt, in the backyard of a Franklin Street home in Watertown, Mass.
Darren McCollester/Getty Images
Investigators work around the boat where Dzhokhar A. Tsarnaev was found hiding after a massive manhunt, in the backyard of a Franklin Street home in Watertown, Mass., April 20, 2013.
Massachusetts State Police
Thermal images taken on April 19, 2013 show Dzhokhar A. Tsarnaev hiding in a boat after a massive manhunt, in the backyard of a Franklin Street home in Watertown, Mass.
Darren McCollester/Getty Images
Investigators work around the boat where Dzhokhar A. Tsarnaev was found hiding after a massive manhunt, in the backyard of a Franklin Street home in Watertown, Mass., April 20, 2013.
Massachusetts State Police
Thermal images taken on April 19, 2013 show Dzhokhar A. Tsarnaev hiding in a boat after a massive manhunt, in the backyard of a Franklin Street home in Watertown, Mass.
Darren McCollester/Getty Images
Investigators work around the boat where Dzhokhar A. Tsarnaev was found hiding after a massive manhunt, in the backyard of a Franklin Street home in Watertown, Mass., April 20, 2013.
Massachusetts State Police
Thermal images taken on April 19, 2013 show Dzhokhar A. Tsarnaev hiding in a boat after a massive manhunt, in the backyard of a Franklin Street home in Watertown, Mass.
Darren McCollester/Getty Images
Investigators work around the boat where Dzhokhar A. Tsarnaev was found hiding after a massive manhunt, in the backyard of a Franklin Street home in Watertown, Mass., April 20, 2013.
Massachusetts State Police
Thermal images taken on April 19, 2013 show Dzhokhar A. Tsarnaev hiding in a boat after a massive manhunt, in the backyard of a Franklin Street home in Watertown, Mass.
