Some prisoners climbed atop the trees and sought an inquiry into the death.
Police said tension prevailed in the jail for some time, as a section of prisoners and undertrials protested, following the mysterious death of a 50-year-old prisoner, serving life sentence last night.
Karuppasamy of Mettupalayam was convicted in a murder case and undergoing life sentence. Jail authorities took him to the government hospital here, after he reportedly complained of chest pain last night, but died on admission early today, police said.
Senior police officials, including City Police Commissioner, A K Vishwanathan rushed to the spot and managed to convice the prisoners that the death was due to cardiac arrest following which they returned to their respective cells, police said.
Tight vigil is being maintained at the prison.