Itatiba do Sul is a municipality in the state of Rio Grande do Sul, Brazil. As of 2020, the estimated population was 3,231.[1] The city is the birthplace of serial killer Luiz Baú who terrorized Erechim and the surrounding areas, Baú was arrested and sent to a psychiatric hospital in Porto Alegre, where in June 30, 1980 he escaped along with four other inmates and has not been seen ever since.