Reshma Akhter, 22, who worked at Lalmatia City Hospital, died at Dhaka Medical College and Hospital (DMCH) on Monday night after an unknown person brought her there.

But the man left the hospital immediately after the doctors had declared her dead.

The Lalmatia City Hospital authorities initially denied that they do not know the victim, but later admitted that she worked for the hospital as a nurse, the investigation officer said.

The hospital authorities also told the police that Reshma went out of the hospital at 9:00am on the day but when she returned in the evening, she looked very sick.

Hafizur Rahman, brother of the victim, filed the murder case. He told The Daily Star that he suspects that Reshma might have been killed at her workplace. Their suspicions were aroused because the hospital authorities did not even inform her family of the incident, he added.

Police suspect that she might have committed suicide by taking poison.

Morgue sources said there were no marks of injuries in her body except a minor injury mark in her shoulder. The reason behind her death would be confirmed after the viscera test, they added.