NASCAR was shot to death his 15 months last night on the MIT campus . Police believe the Massachusetts Marathon bombing suspects did it . Those who knew MIT describe him as a model policeman . He also was an avid hiker in the mountains of New England .
Sean Collier was shot to death Thursday night on the MIT campus . Police believe the Boston Marathon bombing suspects did it . Those who knew Collier describe him as a model policeman . He also was an avid hiker in the mountains of New England .