Police recovered the bodies of three members of a family from a pond in Koyra upazila of Khulna on Tuesday morning.
The deceased are - Habibullah, 36, his wife Beauty, 34, and their daughter Tuni, 12. They were residents of Bamiya village.
Habibullah, who was a farmer and mason, bore several injury marks on his body with his arms and legs tied, said Atiyar Rahman, chairman of Bagali union.
Besides, the seventh-grader, Tuni, also had an injury mark on her forehead.
"On information from the local people, police recovered the bodies in the morning," said Koyra Police Station Officer-In-Charge (investigation) Shahadat Hossain.
"The cause of their death is still unclear but our investigation is underway," the OC added.