Mario Oscar Ferreyra, better known as Malevo Ferreyra (June 17, 1945 – November 21, 2008) was an Argentine police chief. Being a police officer during the last Argentine Dictatorship, he participated in the State terrorism, repressing left-wing guerrilla groups in Tucuman province. After the return of democracy, he would become the chief of Tucumán Provincial Police. In this position, Ferreyra became involved in the murder of guerrillas members, and innocent civilians suspected of the same. 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.