A man who loaned a gun to the Boston Marathon bombers, who used it kill a police officer three days after the 2013 attack, has been sentenced to time already served behind bars, reports the Christian Science Monitor. Stephen Silva was sentenced by U.S. District Judge Mark Wolf after pleading guilty to drug and firearms charges last year. Silva testified in March that he let Dzhokhar Tsarnaev borrow a Ruger 9mm handgun two months before the bombings. He said Tsarnaev told him he wanted it to rob University of Rhode Island students. He said Tsarnaev “kept coming up with excuses” for why he didn't return the gun.