Black leaders in Virginia say they will march every week until they believe justice has been served in the case of a man who died in police custody after officers shocked him repeatedly with stun guns.

Dozens of NAACP members marched Saturday in South Boston and called on the county's prosecutor to complete her investigation into the death of Linwood Lambert Jr.

Videos released last month showed three South Boston police officers using stun guns multiple times on the 46-year-old Lambert, who they had brought to a hospital for a mental health evaluation. He later died in their custody.

Halifax County Commonwealth's Attorney Tracy Quackenbush Martin has not said whether she will bring charges against the officers. Neither she nor the police department immediately responded to a request for comment.