James Taylor warming up on stage on Briggs Field at MIT for Memorial for Officer Sean Collier. (Photo by Paula Ebben, WBZ-TV)
Service For MIT Police Officer Sean Collier
Officers from around the state and country arrive at MIT for Officer Collier. (Photo by Beth Germano, WBZ-TV)
Service For MIT Police Officer Sean Collier
Police Officers walking together to memorial for MIT Officer Sean Collier. (Photo by Paula Ebben, WBZ-TV)
Service For MIT Police Officer Sean Collier
Sign at the front of stage at MIT. (Photo by Paula Ebben, WBZ-TV)
Service For MIT Police Officer Sean Collier
Collier Strong: Pins being handed out at the memorial service for fallen MIT Police officer Sean Collier (Photo by Sera Congi, WBZ-TV)
Service For MIT Police Officer Sean Collier
Long line of officers begin making their way across Briggs Field at MIT. (Photo by David Wade, WBZ-TV)
Service For MIT Police Officer Sean Collier
People beginning to take seats for memorial service for fallen MIT Officer Sean Collier. (Photo by WBZ-TV)
Service For MIT Police Officer Sean Collier
Honor Guard moving into position. (Photo by Ken Tucci, WBZ-TV)
Service For MIT Police Officer Sean Collier
Flag procession at MIT for fallen Police Officer Sean Collier. (Photo by WBZ-TV)
Service For MIT Police Officer Sean Collier
A young woman walks in to MIT Memorial for Officer Sean Collier with the words of 8 year old Martin Richard. (Photo by Paula Ebben, WBZ-TV)
Service For MIT Police Officer Sean Collier
Sea of the area's finest at MIT for fallen Police Officer Sean Collier. (Photo by WBZ-TV)
Service For MIT Police Officer Sean Collier
The flag flies high for Officer Collier at MIT service. (Photo by Beth Germano, WBZ-TV)
Service For MIT Police Officer Sean Collier
Stunning silence on Briggs Field as MIT community gathers to celebrate and honor Sean Collier. (Photo by Paula Ebben, WBZ-TV)
Service For MIT Police Officer Sean Collier
Program for Memorial Service For MIT Police Officer Sean Collier (Photo by Stoughton Police/Facebook)
Service For MIT Police Officer Sean Collier
Bagpipes and drums signal start of MIT service for Officer Collier. (Photo by Beth Germano, WBZ-TV)
Service For MIT Police Officer Sean Collier
Vice President Joe Biden at ceremony at MIT for fallen Police Officer Sean Collier (Photo by WBZ-TV)
Service For MIT Police Officer Sean Collier
Bagpipes at ceremony at MIT for fallen Police Officer Sean Collier (Photo by WBZ-TV)
Service For MIT Police Officer Sean Collier
Officers salute as fallen Police Officer Sean Collier's casket is carried into ceremony at MIT. (Photo by WBZ-TV)
Service For MIT Police Officer Sean Collier
Mourners enter the memorial service for fallen Massachusetts Institute of Technology (MIT) police officer Sean Collier on April 24, 2013 in Cambridge, Massachusetts. (Photo by Mario Tama/Getty Images)
Service For MIT Police Officer Sean Collier
Mourners enter the memorial service for fallen Massachusetts Institute of Technology (MIT) police officer Sean Collier on April 24, 2013 in Cambridge, Massachusetts. (Photo by Mario Tama/Getty Images)
Service For MIT Police Officer Sean Collier
Mourners enter the memorial service for fallen Massachusetts Institute of Technology (MIT) police officer Sean Collier on April 24, 2013 in Cambridge, Massachusetts. (Photo by Mario Tama/Getty Images)
Service For MIT Police Officer Sean Collier
James Taylor at ceremony for fallen Police Officer Sean Collier (Photo by WBZ-TV)
Collier Service
Thousands of people attend the MIT service for Sean Collier.
Service For MIT Police Officer Sean Collier
Mourners enter the memorial service for fallen Massachusetts Institute of Technology (MIT) police officer Sean Collier on April 24, 2013 in Cambridge, Massachusetts. (Photo by Mario Tama/Getty Images)
Service For MIT Police Officer Sean Collier
Police officers salute during the memorial service for slain Massachusetts Institute of Technology (MIT) police officer Sean Collier on April 24, 2013 in Cambridge, Massachusetts. (Photo by Mario Tama/Getty Images)
Service For MIT Police Officer Sean Collier
Mourners enter the memorial service for fallen Massachusetts Institute of Technology (MIT) police officer Sean Collier on April 24, 2013 in Cambridge, Massachusetts. (Photo by Mario Tama/Getty Images)