DeKalb County police have arrested a fourth man for last month's robbery and fatal shooting of an armored car courier outside the Toco Hill Kroger.

Ronny Little, 19, was arrested on Thursday and charged with murder and aggravated assault in connection with the March 25 incident.

"Detectives were able connect him to this case through evidence that was uncovered during this ongoing investigation," DeKalb police spokeswoman Mekka Parish said.

Little, who is is being held at the DeKalb County Jail, is the fourth person charged with murder and aggravated assault in the case.

Edwin Thornton, who was arrested on April 1 after he turned himself in to DeKalb authorities, is also being held in the DeKalb jail.  Ashley Henderson and Stacy Dooley were charged on March 31, and are being held in the Gwinnett County Jail.