Contreras was subsequently sentenced on 23 September 2008 to seven years in prison in connection with the disappearance of Spanish priest Antonio Llidó Mengual. He was ordered to pay 50 million pesos to compensate for the 1974 abduction of Felix Vargas Fernandez and received another 15 years in prison in a March 2009 sentencing. On 6 July 2012, he received an additional 10 years in prison over the detention and disappearance of ex-militants José Hipólito Jara Castro and Alfonso Domingo Diaz Briones in 1974. In total, his sentences over the years added up to more than 500 years in prison.