A patient at Government Medical College Hospital, here, was found hanging on Tuesday.
The police said the deceased, Prabhakaran, 26, was admitted to the hospital on Saturday after having complained of illness.
He was found hanging in the bathroom of the pay ward by his younger brother who was the only person accompanying Prabhakaran. The incident was reported to the police around 6.45 a.m.
Prabhakaran hailed from Virudhunagar district in Tamil Nadu.
The police said he was pursuing his studies in Kerala.
The post-mortem examination was conducted at the hospital, and the body moved to the mortuary.
The police have registered a case in connection with the incident.