The man authorities said was the source of a handgun later used to kill MIT police officer Sean Collier was sentenced to six months in a Boston federal court Tuesday morning.

Merhawi Berhe, 22, had earlier pleaded guilty to possession of of a firearm with an obliterated serial number, reported. Berhe reportedly supplied a black Ruger P95 to Stephen Silva, who then later gave the weapon to his then-friend Dzhokhar Tsarnaev.

Silva himself pleaded guilty to weapons charges and was sentenced to 17 months time served, the report read.

Judge William Young said he did not consider the fact that the gun was ultimately used in connection with the murder of the young officer when making his decision about the sentence. 

“It would be captious were I to hold that against Mr. Berhe,” he said, though he noted it was still a dangerous crime that demanded jail time.

Berhe was the seventh and final suspect to be tried in connection to the Boston Marathon bombings, WHDH reported.