article_snippet: Sean Collier had visible bullet wounds to Sean Collier temple, neck and hand and was so covered in blood that Henniger struggled to pull Sean Collier from Sean Collier vehicle. '
article_snippet: Sean Collier's gun belt and holster were covered in blood, evidence of Tsarnaev's clumsy but unsuccessful effort to steal his handgun, prosecutors have said.
article_snippet: Tsarnaev shows a bloodied service pistol sitting on seat of MIT Police Officer Sean Collier's cruiser . '
article_snippet: Officer Collier was gunned down as Officer Collier pulled up next to the space.
article_snippet: A diagram presented by prosecutors depicts where Officer CollierOfficer Collier's car was parked when Officer Collier was shot in the head.
article_snippet: A wider drawing shows the area surrounding the scene of the deadly shooting.
highlights_snippet: A photo of Collier's bloodied gun and holster was also presented in court .
  
highlights_snippet: Sergeant Clarence Henniger testified to finding Collier shot and gurgling blood in Sergeant Clarence Henniger cruiser on April 18 in 2013 .
  