Two men accused in a carjacking are now charged with murder in the shooting death of one of their cohorts, the Cherokee County Sheriff’s Office said Monday.

The fourth and believed final suspect, Maurice Perkins, was arrested Saturday in Gary, Ind., during a traffic stop, Lt. Jay Baker with the Cherokee sheriff’s office said. Perkins, 20, of Indiana, is expected to be extradited to Georgia.

Perkins and another suspect, Jumar Greer, 19, of Acworth, were charged Monday with murder, kidnapping with bodily injury and aggravated assault, Baker said. Investigators did not release information regarding which man allegedly fired the fatal shot.

Two others, 23-year-old twin brothers Quovadis and Tavarus Arrington, have been charged with hindering the apprehension of a wanted person and making false statements to a law enforcement officer.

On Thursday, Justin Humphries, 19, of Acworth, was carjacked, pistol-whipped and thrown in the back seat of a late model Dodge Charger, the sheriff's office previously said. Humphries was able to walk away when the car crashed about a mile away, despite sustaining head injuries, according to police. He was treated at a hospital and released.

The suspect accused of driving the Dodge during the carjacking was shot during the heist and crashed the car, the sheriff’s office said. Andre Rodriguez, 27, of Acworth, died at the scene after being shot in the back, an autopsy confirmed Friday.

The investigation in the case continues.