Columbus man pleads guilty to armed bank robbery, pistol-whipping employees

A Columbus man pleaded guilty to robbing a Whitehall bank and pistol-whipping two employees while demanding money and conspiring with his girlfriend to hide the gun he used in the robbery.Forty-two-year-old Robert K. Mason pleaded guilty to one count each of bank robbery, using a firearm during a crime of violence and conspiracy to tamper with evidence. He is facing up to life in prison.In a plea agreement, Mason admitted that he robbed the Huntington Bank at 4550 East Broad Street on September