Shahzad Town police Tuesday released senior journalist Ayaz Amir, who had been held a few days ago for investigations into the Sara Inam murder case, reported 24NewsHD TV channel.
Senior Civil Judge Amir Aziz had ordered to discharge Ayaz Amir in the case.
Ayaz had been held under section 109 for aiding and abetting the crime.
Sara Inam had been murdered by Shahnawaz, a son of Ayaz Amir, at his house in Islamabad.
Earlier, the court discharged renowned journalist Ayaz Amir from the murder case of his daughter-in-law Sara Inam.
Judge Amir Aziz ruled that there was no evidence linking Ayaz Amir with the murder case.
Although the police produced him again in District and Sessions Court of Islamabad early Tuesday and sought his five-day physical remand, but the court set aside that request.
Judicial Magistrate Amir Aziz earlier had approved one-day physical remand of Ayaz Amir.
Reporter Ehtesham Kiyani and Kifayat Ali Shah