The deceased was identified as Mukti Khatun, 17, daughter of Abdur Rahim of Sadipur Mohalla in the upazila.
Quoting locals, Ataur Rahman, officer-in-charge of Baghmara Police Station, said Sohel Rana used to torture physically Mukti for dowry.
They locked into an altercation over the same issue on Thursday night and Sohled beat her up mercilessly.
At one stage, when Mukti became senseless and Sohel along with his family members poured poison into her mouth to prove the incident as suicide.
However, she was taken to a village doctor who declared her dead.
On information, police recovered the body and sent it to Rajshahi Medical College and Hospital morgue for autopsy.
Meanwhile, victim’s father Abdur Rahim filed a case with the police station on Friday morning, the OC added.