FILE - This undated file photo released Friday, April 19, 2013, by the FBI shows Dzhokhar Tsarnaev. Russian relatives of Boston Marathon bomberTsarnaev are expected to testify at his trial as his lawyers continue to make their case to spare his life.  Five family members are expected to take the witness stand Monday, May 4, 2015, in federal court.  (AP Photo/FBI, File)
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