Sean Collier
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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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Boston-area police officers march into a one-year remembrance ceremony for Massachusetts Institute of Technology Officer Sean Collier on campus in Cambridge, Mass., Friday, April 18, 2014. Authorities say Collier was slain by the suspects of the 2013 Boston Marathon bombing. (AP Photo/Elise Amendola)

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A mourner places an "MIT Strong" pin on her jacket at a one-year remembrance ceremony for Massachusetts Institute of Technology Officer Sean Collier on campus in Cambridge, Mass., Friday, April 18, 2014. Authorities say Collier was slain by the suspects in the 2013 Boston Marathon bombing. (AP Photo/Elise Amendola)

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Flowers lay at a memorial stone after a one-year remembrance ceremony for Massachusetts Institute of Technology Officer Sean Collier on campus in Cambridge, Mass., Friday, April 18, 2014. Authorities say Collier was slain by the suspects of the 2013 Boston Marathon bombing. (AP Photo/Elise Amendola)

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Massachusetts Institute of Technology employees Jennifer Earls, left, and Deb Shafran stand near a memorial stone after a one-year remembrance ceremony for MIT Officer Sean Collier on campus in Cambridge, Mass., Friday, April 18, 2014. Authorities say Collier was slain by the suspects of the 2013 Boston Marathon bombing. (AP Photo/Elise Amendola)

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FILE - In this November 2012 file photo provided by Nicole Lynch, her brother, Sean Collier, stands in his driveway in Someville, Mass., frying a turkey for his annual kickball Thanksgiving gathering. Investigators said Collier, a Massachusetts Institute of Technology police officer, 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/Nicole Lynch)

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FILE - In this March 14, 2014 file photo, Nicole Lynch, sister of slain Massachusetts Institute of Technology police officer Sean Collier, speaks during an interview at her home in Dracut, 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 the school Friday morning, April 18, 2014. (AP Photo/Elise Amendola, 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)