Thanks to the efforts of a gun-toting Good Samaritan in Georgia , a would-be bank robber is behind bars . A man whose name has not been released was in a Wells Fargo in Marietta when he saw another customer come in and present a teller with a 'demand note ' on Tuesday afternoon . The suspect , 25-year-old Mark Katchem of Chicago , then left the bank . Scroll down for video . A gun-toting Good Samaritan ( left ) put a stop to an apparent bank robber 's ( right ) attempt to steal on Tuesday . Mark Katchem of Chicago was arrested and charged with robbery by intimidation after the alleged robbery . The 25-year-old was booked at the Cobb County Sheriff 's Office and is being held on a $ 15,000 bond . The Good Samaritan followed him out the door and grabbed a handgun from his car , the Atlanta Journal Constitution reported . The man , who used to be in the military , ran after Katchem and tackled him to the ground . He ordered Katchem to stay on the pavement and held him at gunpoint until police could arrive on the scene . The alleged bank robbery occurred at a Wells Fargo in Marietta , Georgia , on Tuesday afternoon . A man witnessed what was happening outside the bank and took a photo , Fox 5 Atlanta reported . He said : ' I immediately knew by the way the man was standing , his stance , he was in control of the situation . 'When you see a situation that ai n't right , some people still do the right thing . ' Katchem was arrested and charged with robbery by intimidation . If he 's convicted , Ketchem is facing imprisonment for a minimum of ten to a maximum of 20 years . He was booked at the Cobb County Sheriff 's Office and is being held on a $ 15,000 bond . A woman who lives near the bank , Charise Debarros , said it was 'wonderful ' that someone was willing to take action against the 'bad people out there ' . Although robbery by intimidation can sometimes be viewed as a 'lesser ' charge , it is often treated the same way as armed robbery . That felony charge is punishable by death or imprisonment for a minimum of ten to a maximum of 20 years .
The man stopped the robber outside of a Wells Fargo in Georgia , Marietta . Man saw alleged robber present a 'demand note ' to teller and followed him out . Grabbed gun from his car and kept suspect on the ground until police came . Robbery suspect Mark Katchem , 25 , was charged with robbery by intimidation .