A man allegedly strangled his pregnant wife after beating her mercilessly on a hill at Ponbazaar under Alikadam upazila of Bandarban on Friday. Police said, immediately after the incident locals caught Eliasur Rahman and handed him over to the police. The victim was identified as Kumira Begum of the same area. Later, police also arrested Eliasur's mother Sahara Khatun and his second wife Ayesha Begum for their alleged involvement in the incident. Kumira Begum had protested the second marriage of her husband which led to her killing, police said.