Marcos Antunes Trigueiro, also known as the Industrial Maniac or the Contagem Maniac, has been associated with multiple murders in Brazil. Despite claims of more victims, he remains formally linked to 5 confirmed murders by the authorities. His brutality and violence have become infamous, and he earned the name the Contagem Maniac. In prison, Trigueiro is renowned for his aggressive retaliations, particularly towards those inmates who "want him dead". His escape from prison has highlighted the lax prison security and the inability of the authorities to maintain control.