Henry County Police Capt. Jason Bolton says Stewart was arrested Friday morning.
Stewart is accused of shooting 35-year-old Damon A. Martin of Detroit in an argument at Stewart's home in Hampton, about 30 miles southeast of Atlanta.
The 28-year-old Stewart is charged with murder and was being held without bond in the Henry County jail Saturday. His first court appearance is scheduled for Jan. 12.
Stewart has worked with Young Jeezy, Snoop Dogg and other major artists.