Police in Fairfax County said Thursday no charges will be filed against a man who shot a 17-year-old in self-defense during a robbery last year.

At around 10:30 p.m. on Sept. 7, officers responded to the 9700 block of Hagel Circle in Lorton for the report of gunshots, Fairfax County Police said in a statement at the time. They found 17-year-old Maurice Anderson Berger of Lorton suffering from gunshot wounds to his upper body, and he was pronounced dead at the scene, the statement said.

On Thursday, Fairfax Police announced in a statement that they closed their investigation into the homicide last month after an investigation showed that Berger, 18-year-old Daniel Winkfield of Lorton and a 17-year-old who police did not name tried to rob an 18-year-old man from Manassas Park at gunpoint during an apparent drug transaction.

The man they tried to rob, who police also did not name, shot Berger in self-defense, according to the statement, and Fairfax County prosecutors determined there was no basis for criminal prosecution. Winkfield, meanwhile, was charged with robbery and is awaiting trial, police said.

Mapping homicides in the District and the surrounding suburbs since 2000.