The 50-year old PPP leader was shot dead in Naushahro Feroze on Feb 16
Despite being a high profile case, the postmortem report in to the matter is yet to be prepared.
The case has been registered at Darya Khan Mari police station on the complaint of Ansari's brother Ali Raza.
President Mehrabpur Press Club Aziz Memon was strangulated to death on Sunday in Naushero Feroze district of the Sindh province.
The family of the woman got irked over the attitude of the hospital administration and staged protest inside the premises for over three hours.