PEABODY — A Peabody man and former Salem State University student was sentenced to life in prison Monday following his conviction on a first-degree murder charge last month. 

Peter Bin, 27, formerly of Bay State Boulevard, was charged with taking part in a planned “drug rip” of a Billerica man in July 2012, the Middlesex District Attorney announced. 

The plan, prosecutors alleged, was for Bin and two other men, Jason Estabrook and Adam Bradley, both of Lynn, to rob Quintin Koehler, 22, of marijuana and cash they believed he had stashed in his Billerica home. Estabrook and Bradley are still awaiting trial. 

Early on the morning of July 7, 2012, three men wearing masks and holding pistols forced their way into the Boston Road home, where they were confronted by Koehler and his brother. 

During an ensuing struggle, Koehler was shot by one of the men.

A fourth man, Gabriel Arias, 22, of Lynn, was convicted of misleading investigators. He was sentenced to seven years in prison, prosecutors announced. 

Bin was charged after police matched DNA on a hat left behind at the crime scene to that found on a discarded cigarette police scooped up while conducting surveillance on Bin. 

Bin was convicted under a “joint venture” theory that is often used when multiple people are involved in a crime, even if only one of those people actually shoots someone. He was also charged with first-degree murder because the killing occurred during the commission of a felony.

Courts reporter Julie Manganis can be reached at 978-338-2521, via email at jmanganis@salemnews.com or on Twitter @SNJulieManganis.

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