Federal prosecutors will not challenge an appeals court ruling in the death penalty case against Boston Marathon bomber ... placed the bomb that killed Krystle Campbell, 29, of Arlington.

Last Tuesday, sitting alone in his Boston Athletic Association office at 40 Trinity Place in downtown Boston, 15 days after the Boston Marathon bombings, he wept.

BOSTON — A jury on Wednesday found Dzokhar Tsarnaev guilty of killing three people and injuring 264 in the 2013 Boston Marathon bombing, as well as fatally shooting a police officer four days later.