Antônio da Costa Santos (also known as Toninho; 4 March 1952 – 10 September 2001) was a Brazilian architect and politician of the Workers' Party (PT). Toninho took office as Mayor of Campinas (the third largest city in the state of São Paulo, with over 1,000,000 inhabitants), on 1 January 2001. He was shot to death at 10:15 pm, 10 September 2001, as he was driving home alone from a shopping mall. The details and motives of his murder, which stunned the country, is still largely unknown as of 2020[update]. Toninho was succeeded in office by the vice-Mayor, Izalene Tiene. He left a daughter and a widow.