People arrive to a memorial service for fallen Massachusetts Institute of Technology campus officer Sean Collier at MIT in Cambridge, Mass. Wednesday, April 24, 2013. Authorities say Collier was killed by the Boston Marathon bombing suspects last Thursday, April 18. He had worked for the department a little more than a year. Vice President Joe Biden, MIT President L. Rafael Reif, police chief John DiFava and members of Collier’s family are scheduled to speak. (AP Photo/Elise Amendola)

Associated Press
People arrive to a memorial service for fallen Massachusetts Institute of Technology campus officer Sean Collier at MIT in Cambridge, Mass. Wednesday, April 24, 2013. Authorities say Collier was killed by the Boston Marathon bombing suspects last Thursday, April 18. He had worked for the department a little more than a year.  Vice President Joe Biden, MIT President L. Rafael Reif, police chief John DiFava and members of Collier’s family are scheduled to speak. (AP Photo/Elise Amendola)
People arrive to a memorial service for fallen Massachusetts Institute of Technology campus officer Sean Collier at MIT in Cambridge, Mass. Wednesday, April 24, 2013. Authorities say Collier was killed by the Boston Marathon bombing suspects last Thursday, April 18. He had worked for the department a little more than a year. Vice President Joe Biden, MIT President L. Rafael Reif, police chief John DiFava and members of Collier’s family are scheduled to speak. (AP Photo/Elise Amendola)
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