article_snippet: Meanwhile, Chief John DiFava revealed Chief John DiFava last words to the 27-year-old officer in a wrenching fifth day of testimony in the long awaited Boston bomber trial.
article_snippet: Chief John DiFava on Wednesday recalled chatting with Sean Collier about an hour before Chief John DiFava death. '
article_snippet: I told Chief John DiFava to be safe, and I left,' Chief John DiFava said, adding it was the last time Chief John DiFava saw Sean Collier alive.
article_snippet: The officer who found Sean Collier, Sergeant Clarence Henniger, said Chief John DiFava was responding to a 911 call about possible shots fired on MIT's Cambridge, Massachusetts, campus, just outside Boston.
article_snippet: Be safe': MIT Police Chief John DiFava testified MIT Police Chief John DiFava told Sean Collier to 'be safe' about an hour before MIT Police Chief John DiFava was shot dead April 18, 2013 .