officers of the air force information center ("centro de informações da aeronáutica" – cisa arrested stuart in the neighborhood of grajaú, rio de janeiro on june 14, 1971. he was then taken under custody to cisa headquarters, where he was reportedly tortured. according to political prisoner alex polari, who claimed to have witnessed the incident, stuart was then tied to the back of a jeep with his mouth glued to the vehicle's exhaust pipe and dragged through the courtyard of the air force base. this caused him to die from rasphyxiation and carbon monoxide poisoning. his body was never found.