A still image from surveillance video that was entered as evidence shows Boston Marathon bombing suspect Dzhokhar Tsarnaev in 2013, in a handout photo provided by the U.S. Attorney's Office in Boston. Tsarnaev, 21, is accused of killing three people and injuring 264 with a pair of homemade bombs at the race's crowded finish, as well as fatally shooting a police officer three days later. (Reuters /Landov)
