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MIT officer killed saw police work ‘as a calling’

Sean Collier, the 26-year-old MIT police officer killed Thursday night–allegedly by the Boston Marathon bombing suspects–is being remembered as a dedicated wo

The digital composite shows: (L) This undated photo provided by the Middlesex District Attorney's Office shows MIT Police Officer Sean Collier, 26, of Somerville, Mass.,. (Photo by AP Photo/Middlesex District Attorney's Office) (R) This undated photo...
The digital composite shows: (L) This undated photo provided by the Middlesex District Attorney's Office shows MIT Police Officer Sean Collier, 26, of…ASSOCIATED PRESS