Tangail District Cultural Officer Redwana Islam was found murdered inside a hospital cabin on Saturday.
Police suspected that the victim's husband strangled her in the hospital in Mirzapur upazila.
Redwana, 34, daughter of Khandakar Rafiqul Islam, is from Rangpur Sadar upazila.
The victim's younger brother Arshadul Abid yesterday filed a murder case with Mirzapur Police Station against his sister's husband Delwar Hossain Mizan, a bank officer in Bhola, who went into hiding after the incident, Gias Uddin, inspector (investigation) of the police station, told The Daily Star.
Police recovered her body from a locked cabin of Kumudini Hospital in Mirzapur on Saturday night and sent it to Tangail General Hospital morgue for an autopsy, he said.
Quoting hospital authorities and relatives, Rizaul Haque Dipu, officer-in-charge of Mirzapur Police Station, said Redwana was hospitalised with labour pains on Monday. She gave birth to a baby girl on the same day.
Her husband came to visit her at the hospital around Saturday noon. Then Redwana's aunt took the newborn to the other room for feeding, leaving the couple in the cabin. She returned sometimes later and found the cabin locked from the outside.
Being informed, an official of the hospital went there and opened the lock with a spare key in the afternoon and found Redwana's body on the bed. He later informed Mirzapur police of the matter, the OC said.
"Injury marks were found around her neck. We suspect that her husband strangled her and fled the spot after locking the door," the OC said.
Redwana's younger sister Fadwana Islam said Redwana and Delwar, 40, of Pabna Sadar upazila, got married in 2019. It was the second marriage for both of them. Redwana already has a 12-year-old son.
She also alleged that since the marriage, Mizan used to torture her sister physically and mentally for dowry. Moreover, he did not accept the pregnancy of Redwana and pressured her for abortion, she also alleged.
OC Rizaul said the body was handed over to the victim's family members after an autopsy at Tangail General Hospital.
"Police were trying to arrest the accused," he added.
Hearing the news, Ataul Gani, deputy commissioner of Tangail, went to visit the hospital.