Juan Manuel Guillermo `` Mamo '' Contreras Sepúlveda ( 4 May 1929 -- 7 August 2015 ) was a Chilean military officer and the former head of the National Intelligence Directorate ( DINA ) , Chile 's secret police during the dictatorship of General Augusto Pinochet .
Juan Manuel Guillermo Contreras Sepúlveda ( 4 May 1929 -- 7 August 2015 ) was a Chilean military officer and the former head of DINA , Chile 's secret police during the dictatorship of General Augusto Pinochet .