Trial Of Boston Marathon Bomber Enters Final Phase

BOSTON, MA - APRIL 6: William D. Weinreb (R), lead prosecutor in the case against Boston bombing suspect Dzhokar Tsarnaev, arrives at John Joseph Moakley United States Courthouse before the beginning of closing arguments in the Boston Marathon Bombing case on April 6, 2015 in Boston, Massachusetts. Tsarnaev, 21, has pled not guilty to 30 charges related to his involvement in the 2013 bombing, which resulted in three deaths and over 250 injuries. (Photo by Scott Eisen/Getty Images) (Photo by Scott Eisen/Getty Images)