18-year-old Randy Dewayne Barnett Jr. was arrested Friday morning at his home near the Bibb and Twiggs County line.
The armed robbery happened early Wednesday morning.
Barnett is being held at the Bibb County Law Enforcement center with out bond.
Bibb Sheriff’s deputies are still searching for the fourth suspect involved. Anyone with information is asked to call the Bibb County Sheriff’s Office at 478-751-7500.