Joran van der Sloot has confessed to killing 21 year-old Stephany Flores Ramirez

Joran van der Sloot could be formally charged as early as Tuesday in the killing of Stephany Flores Ramirez, Peruvian government authorities said.The government authorities said Van der Sloot confessed to murder late Monday. He will likely be held at one of three maximum security prisons — Castro Castro, Piedras Gordas and Lurigancho, authorities said. Efforts by CNN to contact van der Sloot’s