The blood-stained body of a Bangladeshi expatriate in the United Kingdom (UK) was found from a house in Dhaka's Banani area on Friday.
The deceased has been identified as Mejba Uddin Ahmed, 72,  who returned to Bangladesh on Nov 10.
Police said he was an uncle-in-law of Prime Minister Sheikh Hasina's maternal cousin Sheikh Shahidul Islam.
Bhuiyan Mahbub Hossain, officer-in-Charge (OC) of Banani Police Station told The Daily Observer on Friday that "His relatives were unable to reach him on phone since Thursday night. They broke the door of the house to find him dead,
 According to a member of police at the spot, the body was found lying on the floor beside the bed. Blood marks were found on the bed and the toilet, he said.
Police is not yet certain if it was a murder. Three including the building's caretaker and security guard have been taken to the police station for questioning.
Ahmed was living alone in the apartment in the six-storied building in Banani. His relatives live in the other apartments. Relatives said, Ahmed's wife is a Sri Lanka national and the couple's two daughters live in the UK.
OC Mahbub said that the Crime Investigation Department (CID) has reached the spot and started investigations.
Police was yet to confirm whether he was murdered or not, Nurul Alam, assistant commissioner of police in Gulshan zone, told this correspondent.  Police recovered the body and sent that to Dhaka Medical College and Hospital (DMCH) for autopsy.
Police filed an unnatural death (UD) case with Banani Police Station in this connection.  Shaid Zamil nephew of deceased Mejba Uddin Ahmed said his uncle left the country in 1958.