A man who lent the convicted Boston Marathon bomber the gun used to kill a police officer three days after the deadly 2013 attack was set to be released from jail after a judge sentenced him to time served for drug and firearms charges.

A friend of Boston Marathon bombing suspect Dzhokhar Tsarnaev has pleaded not guilty to charges of trafficking heroin and possessing an illegal handgun in connection with the April 2013 bombings.

A friend of Boston Marathon bombing suspect Dzhokhar Tsarnaev is believed to have provided the handgun used to kill a Massachusetts Institute of Technology police officer during the manhunt.