from Who What Why:
Yet another friend of accused Boston marathon bomber Dzhokhar Tsarnaev and his dead brother, Tamerlan, is caught in the seemingly unending expansion of the federal investigation.
Stephen Silva, 21, of Cambridge pleaded not guilty to charges of heroin dealing and possession of a firearm with defaced serial number.
The gun in question is a P95 Ruger 9mm pistol, similar to the one allegedly used by the Tsarnaev brothers in the murder of Massachusetts Institute of Technology police officer Sean Collier and the subsequent shootout with police in Watertown, Mass.
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