Mario Oscar Ferreyra, better known as Malevo (June 17, 1945 – November 21, 2008) was an Argentine police chief. Being a police officer during the Proceso de Reorganización Nacional, he participated in the Dirty War, fighting against left-wing paramilitary groups. After the return of democracy, he would become the chief of Tucumán Provincial Police, being involved in many shootings and the dubious deaths of plenty of supposed criminals. He would later be prosecuted and discharged from the force. He shot himself in 2008, when facing his imminent arrest, and his suicide was broadcast live on national TV.