The Massachusetts Institute of Technology police officer said to have been shot and killed by the Boston Marathon bombing suspects has been identified as 26-year-old Sean Collier.
The Middlesex district attorney's office says Collier was a Somerville resident who had worked at MIT since January 2012. Before that, he was a civilian employee of the Somerville Police Department.
MIT Police Chief John DiFava says Collier was a dedicated officer who was liked by his colleagues and the MIT community.
MIT President L. Rafael Reif says Collier's loss is "deeply painful."
Collier was found shot several times in his vehicle in Cambridge at about 10:30 p.m. Thursday. He was pronounced dead at Massachusetts General Hospital.
Authorities say he was shot by the two suspects in Monday's marathon bombings.