Hyderabad: Taking a serious note of the murder of a retired IPS officer’s wife, the Hyderabad police formed a separate human intelligence network, deployed teams in Nepal and finally arrested a 26-year-old Nepalese woman identified as a key accused in the case.Five months after the murder within the Jubilee Hills police limits, Hyderabad police arrested four accused on Monday for killing Tajuna, wife of retired IPS officer Vinay Ranjan Ray.