When D.C. police close cases without an arrest, families of victims are sometimes left wondering what happened.
The 6800 block of Sixth Street NW in the District. On Aug. 14, 2001, Sean Dixon, 22, of Northeast was shot and killed by Khalil Vanterpool on this street. The case was closed after authorities said the shooting was in self-defense. Ricky Carioti/The Washington Post Buy Photo