 In 2004 he refused to testify before a judge investigating illegal detentions and killings under Operation Condor, and he was put under house arrest.In 2006, another judge struck down Harguindeguy's pardon, along with that of Videla and of fellow minister José Alfredo Martínez de Hoz, as unconstitutional.He died on 29 October 2012 at age 85, while under house arrest.