A man, with the help of an accomplice, killed his wife by slitting her throat in Madhupur upazila on Wednesday night over family feud.
The deceased was Nargis Akter, 30, wife of Harunur Rashid of Boali village.
Harun is a mobile phone shop owner at a market in the upazila.
Police arrested Harun, 40, and his accomplice Sohel Rana, 30, the same night.
Following their confession, police later recovered the knife used in the killing and their blood-stained clothes from the Bonshai river yesterday morning, police said.
Madhupur Police Station Officer-in-Charge Shafiqul Islam said Nargis was married to Harun 18 years ago.
Quarrels between the couple over different matters had been going on since after their marriage. Arbitrations were also held on several occasions, he said.
Being informed by locals, police recovered Nargis's throat-slit body from the house on Wednesday night and detained Harun in this connection, he said.
During interrogation, Harun admitted to the law enforcers that, as per previous plan, he gave Nargis sleeping pills with tea at night. When Nargis fell asleep at around 8:30pm, he and Sohel slit her throat, the OC said.
"The arrestees were sent to a Tangail court for recording their confessional statements," the OC added.