Florence County deputies arrested a fourth person in a fight at Club Nirvana on East Palmetto Street that happened on April 21.
They say Jameyal Thomas assaulted Rickardo S. Sinkler, a bouncer at the Club, who sustained a head injury requiring medical treatment.
Sinkler, Christopher Mack and Joseph B. Singleton, all bouncers at the Club, were arrested earlier this month, and charged with Assault and Battery by Mob.
Investigators say Sinkler, Mack and Singleton assaulted a victim, which sent the victim to the hospital.
The assault was captured on video and posted on the internet.
Thomas, 30, is charged with Assault and Battery Second Degree.
More arrests are possible.