A 17-year-old Washington, DC, youth has been found guilty of murdering a 19-year-old Wheaton man in Silver Spring on Dec. 21, 2010, according to a statement from the office of John J. McCarthy, state's attorney for Montgomery County.

Trenton Robinson, referred to as "Smokey/Trenton" by a witness, was 15 when he, Corey Yates (then 21) and a third person set out to buy marijuana from Doodley Derose at 1616 Huchinson Ln., Silver Spring, according to Robinson's charging documents. A little while later, the third person called the witness to say that Robinson and Yates had shot Derose, the charging documents added.

Police found Derose lying on the kitchen floor, suffering from a gunshot wound, and he died a short time later at a hospital, according to Robinson's charging documents.