Joseph B. Singleton, 23, of Sumter was arrested and charged by Florence County Sheriff's Office investigators with one count of Assault and Battery by Mob, third degree.
Singleton was arrested Wednesday as part of an ongoing investigation into an assault at a local night club.
Singleton and others are accused of assaulting the victim on or about April 21 at Club Nirvana in Florence, according to investigators.
Christopher Mack of Florence and Rickardo S. Sinkler of Sumter, were arrested on May 3 in connection with the same incident.
The assault, which resulted in injuries to the victim, was captured on videotape and posted on the internet.
The investigation is ongoing and additional arrests and/or charges are possible.