Investigators released a surveillance photo showing the suspect.
He's suspected of robbing the Fifth Third Bank at 42 East Ontario Tuesday morning.
Authorities also believe he robbed a North Community Bank branch at 800 North State Street last Monday.
The latest was a non-takeover bank robbery Tuesday afternoon at a TCF Bank branch located at 4355 North Sheridan. This robber is believed to be the same person who carried out three prior robberies at TCF Bank locations on the north side of Chicago dating back to April 26, 2013. The robber was wearing a black coat with a fur-lined hood, dark glasses and a white or cream colored knit cap. No weapon was displayed or implied.
No one was injured in the holdups.
Anyone with information on this suspect should call the FBI or Chicago Police.