Vijay Salve, the deceased, and three others had been arrested two days ago. A court remanded them in police custody for six days yesterday, a senior official said.
Salve was taken to detection room at the police station for questioning at around 12 noon today. He went to the washroom on the pretext of answering nature's call and hanged himself using his t-shirt, said Deputy Commissioner of Police N D Reddy.
He was rushed to a nearby hospital where doctors declared him dead on arrival, another official said, adding that the body was sent for autopsy.