Live video: MIT mourns Sean Collier, a police officer with a common touch

By Bill Dedman and Matthew DeLucaNBC NewsCAMBRIDGE, Mass. – Two young men about the same age apparently crossed paths last Thursday night in the Kendall Square area, on the campus of the Massachusetts Institute of Technology. One was an MIT police officer known for his extraordinary ease at building relationships with foreign students. The other was an immigrant from the Caucasus.Perhaps if they'd...    

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