Thousands of people and law enforcement officers are attending today's memorial service to honor MIT Officer Sean Collier.
The 26-year-old was fatally shot late Thursday allegedly by Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev.
Musician James Taylor will perform during today's service and Vice President Joe Biden will speak.
A live webcast of the service can be viewed here.
Collier's funeral was private and was held Tuesday.
Follow Michael Naughton on Twitter @metrobosmike.