Pugh submitted a letter of resignation dated Thursday. Her resignation is effective immediately, attorney Steven Silverman said at a news conference. She did not attend, and Silverman took no questions.

“Dear citizens of Baltimore I would like to thank you for allowing me to serve as the 50th mayor it has been an honor and privilege,” Silverman read from the letter.

Pugh’s defiant pledge last month to return to work gave way after federal agents raided her home and City Hall office a week ago. She is expected to become the second Baltimore mayor in a decade to quit in connection with a criminal investigation.

Three sources familiar with the mayor’s plans tell The Sun her departure will be announced Thursday afternoon. They spoke on condition of anonymity because the mayor had not yet made her plans public.