PEORIA, Ariz. -- Peoria police tracked down a bank robbery suspect after finding a fingerprint on a demand note.Rafael Ray Williams, 31, is accused of robbing a bank near Northern and 91st avenues on June 21. Police said he gave a teller a note demanding money and indicated he had a gun.The teller was able to deny the suspect's request and he left without any money, according to police spokeswoman Amanda Jacinto. However, the suspect left behind the demand note. A crime scene tech processed the note and identified a fingerprint belonging to Williams.Detectives learned that Williams attempted to rob a Tempe bank the same day and then robbed a Mesa convenience store on June 22.Peoria police detectives and the FBI Bank Robbery Task Force tracked Williams to Flagstaff and took him into custody. They said he admitted to all three robberies.Williams is facing three counts of armed robbery.