Police recovered the body of a minor girl from Siddhirganj upazila in Narayanganj and arrested her stepmother in connection with the killing on Tuesday.
Deceased Sumi Akter, 8, was the daughter of Ankur Moral, a resident of Mizmizi Kandapara area in the upazila.
The deceased's mother Ruma Akter said her daughter Sumi went to her step mother Halimadus Sadia's, 38, house on December 29.
"On Monday night, my husband made a phone call and said that our daughter is injured. When I went there I found my daughter dead. There several injury marks on her body," she added.
Ruma Akter claimed her daughter was tortured to death.
Police said mother of the victim informed them about the incident through a phone call on national emergency hotline number '999'. They recovered the body in the morning and sent it to Narayanganj Hospital morgue.
A case has been filed against Sadia with Siddhirganj Police Station in the afternoon.
The police station officer in-charge Moshiur Rahman said they arrested the accused and produced her before the court.