The MIT police officer gunned down allegedly by the Boston Marathon bombing suspects was honored in Washington as part of "National Peace Officers Memorial Day.”
Vice President Joe Biden honored fallen officers at the 33rd annual memorial service at the capital.
MIT Police Officer Sean Collier was one of many honored for his bravery.
Chief John DiFava said no one can ever replace Collier.
DiFava said, "Sean was a terrific officer, he was probably the epitome of what a police officer should be. Pretty close to being irreplaceable.”
More than half the MIT Police Department turned out for the service.
Collier was previously honored in a memorial service one year after his death.
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