Antonio McCallister, 23, was fatally shot in Southeast Washington, D.C., on the evening of Friday, July 24, 2015. The shooting happened about 10:38 p.m. in the 2700 block of Langston Place, SE. Police found McCallister with a gunshot wound and he was taken to a local hospital, where he died.

Investigators identified a 23-year-old neighbor, Eric McDuffie, as the alleged shooter. A witness told police the assailant came up behind McCallister and shot him, then ran to a nearby home. McDuffie later surrendered and was charged with first-degree murder in connection with the killing.

Does anyone have information about that block of Langston Place or the night of July 24, 2015, that could help fill gaps in the timeline?