Cambridge Police report they are looking for help in finding a man who held up the Central Square 7-Eleven on April 18, 2013, shortly before MIT police officer Sean Collier was shot to death.
In the initial confusion following Collier's death and the car chase that ended in a shootout in Watertown, police at first thought the bearded man who held up the convenience store might be one of the Tsarnaevs.
According to police, the man walked into the store, asked the clerk for change, then took out a gun and used it to order the clerk to give him money from the register.
If he looks familiar, contact Det. Brian O'Connor at 617-349-9307.