Johnson is also suspected in at least nine other robberies but has not been charged.
Investigators say the "45-second bandit" gave bank employees 45 seconds to meet his demands.
If convicted, Johnson faces up to 20 years in prison.
FBI: '45-second bandit' in custody
January 9, 2009 (CHICAGO)
Nineteen-year-old Andrew Johnson was arrested Thursday night.
He was charged with one count of bank robbery for holding up the Bank of America in the 5400-block of North Milwaukee last November.
