An 18-year-old Southeast resident was fatally shot Sunday in Southeast, and a 15-year-old girl was arrested and charged with second-degree murder while armed, D.C. police said.

Gary Gordon was found shot about 2 p.m. in an apartment in the 2600 block of Stanton Road, officers said. He had been a basketball player at Anacostia High School. School Principal Ian Roberts said he “played on the JV team last year.” The suspect’s name was not released.