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APTOPIX Police Conver_Hass.jpg

Massachusetts Institute of Technology Police Officer Sean Collier, 26, of Somerville, Mass., was shot to death Thursday, April 18, 2013, on the school campus in Cambridge, Mass. Authorities said surveillance tape recorded late Thursday showed one of the Boston Marathon bombing suspects during a robbery of a nearby convenience store before Collier was shot to death while responding to a report of a disturbance. (AP Photo/Middlesex District Attorney's Office)