Mr Van der Sloot went on trial last week for the murder of Stephany Flores, whom he met at a Lima casino.
She was found dead in a hotel in the Peruvian capital on 30 May 2010.
Mr Van der Sloot is a suspect in the disappearance in 2005 of US student Natalee Holloway, 18, on the Caribbean island of Aruba. Her body has never been found.
Stephany Flores was murdered five years to the day after Natalee Holloway was last seen.