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MIT police officer Kevin O’Connor paid tribute to fellow officer Sean Collier in front of Building 32 on Friday, April 19, 2013. Collier was killed near this location the previous night by the Marathon bombing suspects.

The Green Building was lit up in purple on Friday, Apr. 19.

Messages and gifts of thanks and in remembrance of slain MIT police officer Sean A. Collier were displayed at the lobby of MIT Police headquarters.

Messages and gifts of thanks and in remembrance of slain MIT police officer Sean A. Collier were displayed at the lobby of MIT Police headquarters.

Messages and gifts of thanks and in remembrance of slain MIT police officer Sean A. Collier were displayed at the lobby of MIT Police headquarters.

The Green Building at MIT was lit in tribute to slain MIT police officer Sean A. Collier on the night of Apr. 19.

A makeshift memorial to MIT police officer Sean A. Collier was erected by a steady stream of visitors in front of Building 32 on Friday, Apr. 19.

A steady stream of visitors paid tribute to MIT police officer Sean A. Collier in front of Building 32 on Friday, Apr. 19. Collier was slain near this location on Apr. 18.

A steady stream of visitors paid tribute to MIT police officer Sean A. Collier in front of Building 32 on Friday, Apr. 19. Collier was slain near this location on Apr. 18.

Police officers return to the Cambridge Police Headquarters in East Cambridge after the manhunt on Friday, Apr. 19.

MIT police officer Kevin O’Connor paid tribute to fellow officer Sean A. Collier in front of Building 32 on Friday, Apr. 19. Collier was slain near this location the prior evening.

A steady stream of visitors paid tribute to MIT police officer Sean A. Collier in front of Building 32 on Friday, Apr. 19. Collier was slain near this location on Apr. 18 in his police cruiser.

Photo taken at the scene of the fatal shooting of the MIT police officer late yesterday night near 32 Vassar Street.

Ryan J. Madson ‘13 finished fourth in his final national competition.

Treasurer-elect Parth Trivedi is a first-year S.M. candidate in Aero/Astro and received a B.S. from Purdue. “I think serving the community is a fundamental responsibility and I have always tried to maintain that where...

President-elect Caleb Waugh is a fifth-year MsC student in Nuclear Science and Engineering.“The institute is so responsive to our input and needs. The GSC can make enormous impact, and it can be used for a lot of good...