Senseless. What do these attacks accomplish?
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Sean Collier had only worked at the Massachusetts Institute of Technology for about a year. But he was already popular with his colleagues in the campus police department, as well as with students, often joining them on hiking and skiing trips.

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.

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