
The deceased was identified as Nazim Uddin, son of Obayed Ullah of Jahanabad village.
Khorshid Alam, officer-in-charge of Sonaimuri Police Station, said Nazim had an altercation with his roommate Abu Sayed, 16, son of Rustam Ali of Mymensingh district over wearing a cap.
Sayed killed Nazim by slitting his throat with a sharp weapon while he was asleep around 2:30 am, he said.
Other students of the madrashah and a teacher noticed the matter and informed police who arrested Sayed, reports UNB.
During primary interrogation, Sayed confessed to his guilt,s aid police.
The body was sent to the 250-bed Noakhali General Hospital.