Andrew Collier, left, puts his hand on his brother, Robert, after delivering the eulogy at a memorial service for their brother, slain Massachusetts Institute of Technology campus officer, Sean Collier, at MIT in Cambridge, Mass. Wednesday, April 24, 2013. Sean Collier was fatally shot on the MIT campus Thursday, April 18, 2013. Authorities allege that the Boston Marathon bombing suspects were responsible.(AP Photo/Elise Amendola)

Associated Press
Andrew Collier, left, puts his hand on his brother, Robert, after delivering the eulogy at a memorial service for their brother, slain Massachusetts Institute of Technology campus officer, Sean Collier, at MIT in Cambridge, Mass. Wednesday, April 24, 2013. Sean Collier was fatally shot on the MIT campus Thursday, April 18, 2013. Authorities allege that the Boston Marathon bombing suspects were responsible.(AP Photo/Elise Amendola)
Andrew Collier, left, puts his hand on his brother, Robert, after delivering the eulogy at a memorial service for their brother, slain Massachusetts Institute of Technology campus officer, Sean Collier, at MIT in Cambridge, Mass. Wednesday, April 24, 2013. Sean Collier was fatally shot on the MIT campus Thursday, April 18, 2013. Authorities allege that the Boston Marathon bombing suspects were responsible.(AP Photo/Elise Amendola)
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