Aisling Brady McCarthy, 37, surrendered Tuesday at the Burlington, Mass. office of the U.S. Immigration and Customs Enforcement, spokesman Shawn Neudauer confirmed.
She's been arrested and placed in federal custody, pending her deportation to her native Ireland.
McCarthy had been charged in the 2013 death of Rehma Sabir, of Cambridge. On Monday, prosecutors dropped the charge after the medical examiner's office revised its original homicide ruling.