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Left: JOHANNES HIRN/LANDOV; Right: Handout
Marathon bombing suspects Tamerlan Tsarnaev (left), pictured in 2009, and Dzhokhar Tsarnaev, in a yearbook photo.
Left: JOHANNES HIRN/LANDOV; Right: The Lowell Sun/Julia Malakie/AP
Tamerlan Tsarnaev practiced boxing at the Wai Kru Mixed Martial Arts center in Boston in 2009 (left), and received a boxing trophy in 2010.
Left: BOSTON REGIONAL INTELLIGENCE CENTER; Right: Robin Young vis AP
Dzhokhar A. Tsarnaev, pictured at a Cambridge gas station early Friday morning (left) and after graduating from Cambridge Rindge and Latin High School.
Tamerlan Tsarnaev got his hands laced at a Golden Glove event in Lowell on 2006 (left) and posing with former professional boxer Micky Ward.
Glenn DePriest/Getty Images)
Tamerlan Tsamaev (left) during a boxing in Utah in 2009.
An undated image of what appears to be Dzhokhar Tsarnaev taken from VKontakte, a Russian social media site.
Dzhokhar A. Tsarnaev (left) and Tamerlan Tsarnaev were pictured on Boyston Streen shortly before the Boston Marathon bombings.
What appears to be Dzhokhar A. Tsarnaev (left, in white hat) is shown walking away after the Marathon bombings on Monday.
CBS NEWS/AFP/Getty Images
This image shows Tsarnaev, who was captured after being found hiding in a boat in a Watertown backyard.
Medical workers treated Dzhokhar A. Tsarnaev moments after he was captured.