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Charlotte, N.C. • A North Carolina prosecutor says a Charlotte police officer acted lawfully when he shot and killed a black man in a case that touched off several nights of unrest in the city.

Charlotte-Mecklenburg District Attorney Andrew Murray made the announcement Wednesday in the shooting by officer Brent Vinson.

Vinson, who also is black, shot and killed Keith Lamont Scott on Sept. 20.

Scott was sitting in his vehicle at an apartment complex when he was confronted by police. Police video showed officers shouting for Scott to drop a gun numerous times. Scott's family has said he was not armed.

However, Murray displayed a nearby store's surveillance video showing the outline of what appeared to be a holstered gun on Scott's ankle, and he discussed other evidence that Scott was armed.