Multan City Police Officer Chaudhry Muhammad Saleem dismissed sub-inspector Noor Akber of Muzzafarabad Police Station in Multan after he failed to submit the charge-sheet of the case to the court, 15 months after her murder.
The court had repeatedly ordered Akber to submit a charge-sheet so that the case could proceed further, Geo news reported.
Akber had sought an extension for investigation every time, following which the court had also issued orders for seizing the investigation officer's salary, it said.
Baloch, who shot to fame for her provocative selfies that polarised Pakistan, was allegedly strangled in July by her brother Muhammad Waseem.
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He said she had brought shame on the family and confessed to his crime in a press conference after his arrest.
Prior to her death on July 15, Baloch, whose real name was Fauzia Azeem, spoke of worries about her safety and had appealed to the interior ministry to provide her with security.
In Facebook posts, Baloch spoke of trying to change "the typical orthodox mindset" of people in Pakistan.
The so-called 'honour-killing' had sent shock waves across the country and triggered an outpouring of grief on social media for Baloch.