Man pleads guilty to gun charge connected to Boston Marathon bombing

A man pleaded guilty on Thursday to owning the gun that was used to kill MIT Police Officer Sean Collier days after the Boston Marathon bombing. 

Merhawi Berhe faces up to 16 months in jail and three years of probation. Berhe appeared in federal court on Thursday.

Authorities say he knowingly owned a gun that had its serial number filed off. 

Prosecutors say Berhe did not know the gun would be used in a violent act. 

A friend of convicted bomber Dzhokar Tsarnaev gave the gun to Tsarnaev after the friend got it from Berhe, according to authorities. 

Police say the gun was used to kill Collier in his cruiser in Cambridge days after the bombing.

Police recovered the gun after the shootout with police in Watertown. 

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