photos

A large American flag was raised behind the stage at Sean Collier’s memorial by two firetruck ladders.

Hackers placed the MIT Police badge on the façade of Building 10 in memory of Officer Sean Collier.

Hackers hung a banner inside Lobby 7 in memory of fallen MIT police officer Sean Collier.

Students in Simmons Hall printed a gigantic MIT Police badge across hundreds of pieces of 8.5”x11” paper. The sheets were assembled and hung in Simmons Dining.

Residents of Next House left hand prints across a poster thanking the MIT Police Saturday night. Residents also wrote individual cards which were then delivered.

The Green Building at MIT was lit in tribute to MIT police officer Sean Collier on the night of April 19, 2013.

A large sign from the women of McCormick Hall joins many others at MIT Police Headquarters in thanking and remembering Officer Collier.

Residents of East Campus’ Fifth East provided a donations bin during their party Saturday night. Proceeds went to the Jimmy Fund, of which Officer Collier was a longtime supporter.

A makeshift memorial to MIT Police Officer Sean Collier was erected by a steady stream of visitors in front of Building 32 on Friday, April 19, 2013.

Hackers placed the MIT Police badge on both the shoulder and chest of The Alchemist on April 22, 2013 in memory of Sean Collier.

At 2:45 p.m. on Monday, April 22, members of the MIT community stood hand in hand forming a human chain along Vassar Street from the Collier memorial at Stata to the MIT Campus Police station for a statewide moment of...

Hundreds of paper cranes and origami flowers were draped on the MIT police cruiser in the Stata Center in honor of Officer Sean Collier.

A sign for Officer Collier adorns the window of the MIT Police Headquarters on Vassar Street.

A steady stream of visitors paid tribute to MIT police officer Sean Collier in front of Building 32 on Saturday April 20. Collier was slain near this location on April 18 in his police cruiser.

Police officers return to the Cambridge Police headquarters in East Cambridge after Friday’s manhunt was over.