Police claimed that they have arrested the mastermind of Police Superintendent’s wife murder.The detainee Shahjaman alias Rabin, 28, was arrested from Shitoljhorna area under Bayezid Police Station.Police Commissioner Iqbal Bahar confirmed the information at a regular press briefing of Chittagong Metropolitan Police on Saturday noon.It is mentionable that, Mahmuda Khanam Mitu, wife of Police Superintendent Babul Akter, was hacked and shot dead by miscreants on June 5 in Chittagong.