Authorities say the suspect handed the teller a note demanding money. The teller believed the suspect was armed but he did not show a weapon.
The suspect left the bank and was last seen crossing Natural Bridge and riding a bike with a broken chain on it.
He is described as 30 to 35 years old, 6-feet to 6-foot2 inches tall and weighing around 220 – 250 pounds. He had a beard and was wearing a dark baseball cap, blue jeans and a white t-shirt underneath a dark hooded sweatshirt.
Anyone with information is asked to contact the St. Louis City Police.