Joran van der Sloot Moved to Remote Prison After Authorities Say He Threatened Warden
08/26/2014 AT 02:45 PM EDT
Peruvian prison spokeswoman Janeth Sanchez told the Associated Press that the 27-year-old Dutchman was moved Sunday to Challapalca, located high in the Andes near the Bolivian border. He previously was held at a prison north of Lima.
Van der Sloot was the last person seen with Holloway, who vanished while on a graduation trip to Aruba. He is imprisoned for killing Stephany Flores, a 21-year-old Peruvian business student, in 2010.
He married his pregnant Peruvian girlfriend in a prison ceremony last month.