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. Ho Yin Au—The Tech May. 9, 2016 Facebook Twitter Reddit Print 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. Ho Yin Au—The Tech