In this Monday, April 15, 2013, file photo, an emergency responder and volunteers, including Carlos Arredondo, center in cowboy hat, push Jeff Bauman in a wheelchair after he was injured in one of two explosions near the finish line of the Boston Marathon. On Friday, May 15, 2015, Dzhokhar Tsarnaev was sentenced to death by lethal injection for the terror attack. (AP Photo/Charles Krupa, File)
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