A Boston police officer at the center of one of the most notorious police brutality cases in city history used unreasonable force while arresting a man in the North End in 2009, then lied about the episode to department investigators, according to an Internal Affairs Division report obtained by the Globe.

As a result, Officer David C. Williams has been placed on paid administrative leave, the Boston Police Department said, and could lose his job under Police Commissioner Edward F. Davis’s nearly 19-month-old policy of dismissing officers who lie in the line of duty, to internal affairs investigators, or in court . Williams is appealing the finding, and a hearing is scheduled for later this month.