An Upton man pleaded guilty on Thursday to robbing four banks in a two-week period, stealing more than $49,000.

Brandon Coldwell pleaded guilty to four counts of bank robbery before U.S. District Court Chief Judge Patti B. Saris to four counts of bank robbery. He is scheduled to be sentenced on Sept. 3.

Coldwell began his two-week crime spree on Sept 11, 2014, by robbing the Mt. Washington Bank in Dorchester.  Thereafter, Coldwell robbed a Citizen’s Bank branch in Brookline on Sept. 17, another Citizen’s Bank in Milton two days later and a third Citizen’s Bank in Framingham on Sept. 24.

In all four robberies, Coldwell threatened to shoot bank employees if the tellers did not comply with his demands for cash.

Law enforcement identified Coldwell as the perpetrator based on his unique arm tattoos, which were captured on bank surveillance video. During the two weeks he committed the robberies, Coldwell was active on social media and posted pictures of himself wearing the clothing he wore when he committed the crimes, as well as displaying his arm tattoos.

Coldwell is scheduled to be sentenced on Sept. 3. He faces a maximum sentence on each of the four counts of 20 years in prison, three years of supervised release and a fine of $250,000.