In early 1980, Falcone joined the ‘Office of Instruction’ (Ufficio istruzione), the investigative branch of the Prosecution Office of Palermo. He started to work at a particularly tense moment. Judge Cesare Terranova, a former parliamentary deputy and Antimafia reformer who had been the main prosecutor of the Mafia in the 1960s, was to have headed this office, but he was killed on 25 September 1979. Only two months earlier, on 21 July 1979, Boris Giuliano had been assassinated; he headed the police investigation squad investigating heroin trafficking by the Mafia headed by Rosario Spatola and Salvatore Inzerillo. Taking Terranova's place was Rocco Chinnici, who was murdered by the Mafia in 1983.