Man pleads guilty in gun case linked to marathon

Stephen Silva changed his plea to guilty in federal court

FILE - This Nov. 21, 2013 Massachusetts Bay Transit Police file booking photo provided by the Dorchester District Court in Boston shows Stephen Sergio Silva, after he was arrested and charged with selling marijuana at a Boston train station. Silva, a friend of Boston Marathon bombing suspect Dzhokhar Tsarnaev, is in federal court in Boston Wednesday, Aug. 6, 2014 on charges of heroin trafficking and possession of a handgun with an obliterated serial number. (AP Photo/Massachusetts Bay Transit Police, File)

BOSTON (AP) — A man charged with having once possessed the gun that prosecutors believe the Boston Marathon bombing suspects used to kill an MIT police officer pleaded guilty Friday to gun possession and drug charges.

Stephen Silva, 21, changed his plea in U.S. District Court. He initially pleaded innocent after he was charged in July with possession of a handgun with an obliterated serial number and seven counts of heroin trafficking.

Silva was a friend of marathon bombing suspect Dzhokhar Tsarnaev, who faces trial in January in connection with the April 2013 attack that killed three people and injured more than 260 others.

A prosecutor said Silva possessed the Ruger pistol in February 2013, and gave it to another individual. That person was not identified in court and no reference was made to the bombing or the fatal shooting of Massachusetts Institute of Technology police officer Sean Collier several days after the attack.

“He has not been charged with having anything to do with the marathon bombing (or) having any knowledge that the gun, if it were used, was used in connection with the bombing or the aftermath,” said Silva’s lawyer, Jonathan Shapiro, after Friday’s hearing.

Shapiro had confirmed earlier that authorities believed the gun was the one Tsarnaev and his older brother Tamerlan used to kill Collier, who was shot in his cruiser in Cambridge during the massive manhunt following the bombing attack.

Tamerlan Tsarnaev died later in a police shootout in Watertown. Dzhokhar Tsarnaev has pleaded not guilty to numerous charges, some of which carry the death penalty.

Shapiro refused to speculate on whether his client might testify in Tsarnaev’s trial. Silva’s plea agreement with the government was sealed, the lawyer said, “because both parties have decided that there is information in it that shouldn’t be made public.”

Federal judge Mark Wolf scheduled sentencing for March 17.

Silva told police he smoked marijuana every day because “my best friend was the bomber,” according to court documents in a separate state marijuana case last year. He was a high school classmate of and also for a time was enrolled at the same university as Dzhokhar Tsarnaev.

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