Middlesex District Attorney'S Office
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FILE - This undated file photo released by the Middlesex District Attorney's Office shows Massachusetts Institute of Technology Police Officer Sean Collier, of Somerville, Mass. Collier was killed in an encounter with Boston Marathon bombers. The family of Collier, who was killed by the Boston Marathon bombers, is creating a foundation in his name. The Sean Collier Memorial Fund will be announced Thursday, Jan. 19, 2017, in Boston. (Middlesex District Attorney's Office via AP, File)
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This undated file photo released by the Middlesex District Attorney's Office shows Massachusetts Institute of Technology Police Officer Sean Collier, of Somerville, Mass. Investigators said Collier was shot to death Thursday, April 18, 2013, on the school's campus in Cambridge, Mass., by Boston Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev in a botched attempt to obtain his gun several days after the twin explosions. (AP Photo/Middlesex District Attorney's Office, File)
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FILE - This undated photo provided by the Middlesex District Attorney's Office shows Massachusetts Institute of Technology Police Officer Sean Collier, 26, of Somerville, Mass. Investigators said Collier was shot to death Thursday, April 18, 2013 on the school campus in Cambridge, Mass., by Boston Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev in a botched attempt to obtain his gun several days after the twin explosions. Collier will be remembered on the first anniversary of his death in a ceremony at MIT Friday morning, April 18, 2014. (AP Photo/Middlesex District Attorney's Office, File)
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This undated photo provided by the Middlesex District Attorney's Office shows Massachusetts Institute of Technology Police Officer Sean Collier, 26, of Somerville, Mass., who 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)
