Authorities say the 26-year-old Collier was shot and killed by the Boston Marathon bombing suspects.
MIT says Collier was a Wilmington native and Somerville resident who had worked at MIT since January 2012. Before that, he was a civilian employee of the Somerville Police Department.
MIT Chief John DiFava says Collier was a dedicated officer, 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 at about 10:30 p.m. Thursday.
Sources say he was ambushed, killed in cold blood while he was sitting in his car.
LINK: PHOTOS OF MARATHON SUSPECTS