Turner, Shelton and several others apparently were walking back to a party on Main Avenue when Cash approached them and told them they weren't allowed in that "territory" anymore, police reports said.
Witnesses told police Cash pulled out a handgun and began shooting, police reports said.
Turner, 22, is facing federal charges in the October 1996 shooting death of Jennifer LaBelle Folmar.
The 23-year-old Bunker Hill, W.Va., woman was found shot and stabbed to death in a car along a Shepherdstown, W.Va., street.
Turner also was indicted in West Virginia on charges of dealing cocaine allegedly obtained in New York, Washington and Hagerstown. He is in federal custody.
When charged in the shooting incident, Cash already was in the Washington County Detention Center awaiting trial on charges he cut Kevin L. Sanders in August 1996, police said.
Police responded to the West End Car Wash at 11 p.m. on Aug. 8 to a report of a robbery. When they arrived, they found Sanders cut and bleeding from a facial wound.
Hesitant to cooperate, Sanders first said he was cut by three men who robbed him.
But later police learned there was a fight over drug territory and that the person who allegedly brandished the weapon that cut Sanders was called "Psych.''
Sanders said he was in a phone booth with his back turned when his assailant came up behind him and cut him with a razor or box cutter.
Sanders later identified Odessa Cash in a police line-up as his assailant, police reports said.