MIT Police Officer Sean Collier, 26, of Somerville, Mass., was shot and killed on April 18 of last year. Police said Boston Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev were the ones who shot him.
Middlesex District Attorney's Office / Associated Press
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- Massachusetts Institute of Technology
- Sean Collier
- Tamerlan Tsarnaev
- Boston Marathon Bombing
- Dzhokhar Tsarnaev