He was later taken to Khagrachhari Sadar hospital.
The jail super said three committees were formed to investigate the incident.
Didarul could not be reached for comments over phone despite repeated attempts. After receiving information, we went to Khagrachhari Sadar Hospital and found Milon dead, said Mohammad Rashid, officer-in-charge of Khagrachhari Sadar Police Station.
Khagrachhari Civil Surgeon Nupur Kanti Das said, We re trying to find the cause of death.
Asked, Nupur said they were not sure yet whether the victim died by suicide. We can be sure only after the post-mortem.
The jail super said the district administration gave Tk 10,000 to Milon s family for burial.