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October 22, 2014

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FILE - This combination of undated family photos shows, from left, Martin Richard, 8, Krystle Campbell, 29, and Lingzi Lu, a Boston University graduate student from China. Richard, Campbell and Lu were killed in the bombings near the finish line of the Boston Marathon on April 15, 2013, in Boston. A year after the bombings, prosecutors have said they have a trove of evidence to use against suspect Dzhokhar Tsarnaev, including surveillance video showing him placing one of the bombs just yards from Martin Richard. (AP Photo/File)

AP

FILE - This combination of undated family photos shows, from left, Martin Richard, 8, Krystle Campbell, 29, and Lingzi Lu, a Boston University graduate student from China. Richard, Campbell and Lu were killed in the bombings near the finish line of the Boston Marathon on April 15, 2013, in Boston. A year after the bombings, prosecutors have said they have a trove of evidence to use against suspect Dzhokhar Tsarnaev, including surveillance video showing him placing one of the bombs just yards from Martin Richard. (AP Photo/File)