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Members of the MIT community joined law enforcement officials at the memorial for Sean Collier Wednesday on Briggs Field.

Vice President Joseph Biden spoke at Sean Collier’s memorial service on Wednesday.

A Massachusetts State Police helicopter flies over Briggs Field.

MIT police officers place the casket of their fallen colleague down.

Members of the Irish American Police Officers Association of Massachusetts play on the bagpipes in honor of Sean Collier.

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.