Swain, 41, had his initial appearance Feb. 24 in the Justice Court of Clay County.
No plea was entered in an initial appearance. A preliminary hearing has been set for March 9, according to a court spokesperson, during which he is expected to be bound over to the Clay County Circuit Court.
Bond was set at $1.2 million as Swain remains in custody of the Clay County Sheriff's Office.
According to Scott, both the suspect, Swain, and the victim, Gray, 28, were Yokohama workers who had just finished the third shift at the tire manufacturing facility when the shooting reportedly occurred just after 7 a.m.
Scott said "some type of argument or altercation" between Gray and Swain preceded the shooting.
Gray, of nearby Starkville, Miss., was taken to the Northern Mississippi Medical Center, where he was pronounced dead just after 8 a.m., Scott said.
In the wake of the shooting, Yokohama temporarily suspended production at the facility and provided grief counseling for employees. Production has resumed at the plant, according to a Yokohama spokesperson.