Police have arrested the killer of seven-year-old child Sayma from Sonargaon Upazila of Narayanganj on Sunday.
The arrested youth is identified as Harun-or-Rashid, cousin of the house owner.
Wari Division Acting Deputy Commissioner Iftekher Ahmed confirmed the matter.
Earlier, police have identified him through a video footage. He went into hiding after the incident.
Harun-or-Rashid has been living with his brother in the same under-construction building where the child was murdered.
Samia Afrin Sayma, whose body was found in an under-construction building in Dhaka’s Wari area on Friday night, was raped before being murdered.
Confirming the matter, Dr Sohel Mahmud, head of Dhaka Medical College Hospital (DMCH) Forensic Medicine Department, said she was raped and strangled.
Sayma, 7, daughter of Abdus Salam and a student of Silverdale School, was found dead on the eighth floor of the building.
“Several injury marks were found on her face and neck. The child was strangled and raped before the murder. We have found the evidence,” said Dr Sohel.
Nurul Amin, additional deputy commissioner of DMP's Wari Division said, “After taking permission from her mother, Sayma left her apartment on Friday evening to play with other children of the building as she did every day.”
“Sayma had remained missing since then. Family members called police after they found her blood-stained body lying on the floor with a rope around her neck” he said.
The victim’s father said he and his wife found the hanging body of Sayma on the eighth floor of the building which was empty, hours after she went missing. Abdus Salam is living in the same building with his family.
Being informed, police recovered the body.
Police suspect that Sayma might have been killed after rape.
Abdus Salam filed a case on Saturday accusing some unknown people.
Md Samsuzzaman, assistant commissioner (Wari zone), said they, however, detained five people for interrogation including the house owner.